Units 1-2单元语法专项强化训练100 题 2026-2027 学年译林版九年级上册英语

**基本信息** 译林版九年级上册Units 1-2语法专项训练，通过50道单选、35道填空、15道句型转换的分层设计，聚焦连词、宾语从句等核心语法，实现从基础认知到综合运用的递进，适配新授课语法强化需求，提升语言能力与思维品质。 **分层设计** |层次|知识覆盖|设计特色| |----|----------|----------| |基础层|连词（neither...nor等）、宾语从句连接词|单考点聚焦，如单选考连词搭配与主谓一致| |进阶层|时态、主谓一致、非谓语动词|语境化填空，结合时间状语考查语法应用| |综合层|句型转换、句式合并、否定句改写|综合语言运用，如同义句转换与从句合并训练|

专项集中训练，扫清语法盲区 译林版（新教材）九年级上册月考复习（Units 1-2） 语法专项强化训练100题 学校：______________ 班级：______________ 姓名：______________ （考试时间：60分钟 满分：100分） 一、单项选择（共50小题；每小题1分，满分50分） 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 ( )1．—It’s a pity that ________ my teachers ________ parents allow me to swim alone. —After all you are too young, safety first. A．either; or B．neither; nor C．both; and D．not only; but also ( )2．Neither Tony ________ I am interested in playing games. A．nor B．because C．or D．so ( )3．________ Auntie Jane ________ her children likes playing bridge. A．All; with B．Not only; but also C．Both; and D．/; as well as ( )4．Not only you but also I ________ going to form a habit of listening to English every morning. A．are B．is C．am D．be ( )5．Neither Jim nor I ________ our promises easily. So our classmates like to be friends with us. A．break B．breaks C．was breaking D．broke ( )6．You can take ________ this magazine ________ that one, but you can’t take ________ of them. A．not only; but also; either B．not; but; either C．neither; nor; both D．either; or; both ( )7．Either you or I________ at home when mum is out. A．be B．am C．is D．are ( )8．If you keep on working hard, I have no doubt ______ you will be successful in the future. A．that B．what C．if D．when ( )9．— The match is so exciting. The opposite team is really strong. — You’re right. But I am sure ________ our team will win! A．if B．that C．whether D．why ( )10．I suppose that ________ Kitty ________ Sam are interested in the Summer Palace. They have never been there before. A．not only; but also B．both; and C．either; or D．neither; nor ( )11．The movie Lost in Hong Kong (《港囧》) is interesting. ________ Jack ________ his sister want to watch it. A．Both; and B．Either; or C．Neither; nor D．Either, and ( )12．All the students except Tom ________ from school since the class ended. He is really hard-working. A．have left B．has left C．have been away D．has been away ( )13．Mr. White ________ his wife is interested in sports. A．as well as B．and C．but D．except ( )14．—Nancy, where is your brother? —He as well as his classmates __________ the World Cup games in that room. A．watch B．watches C．is watching D．are watching ( )15．Not only Sun Yingsha but also her teammates ________ hard every day to win matches. A．train B．trains C．trained D．training ( )16．—Which show do you like better? China’s Got Talent or Readers? —Readers, of course, ________ I ________ my brother likes it. A．Both; and B．Neither; nor C．Not only; but also D．All; and ( )17．________ the students ________ the teacher knows the answer to this difficult question. So pity! A．Both...and B．Either…or C．Neither...nor D．Not only...but also ( )18．—________ you ________ Daniel has to finish the report tonight. —Why not ask both? It will take much time. A．Not only; but also B．Neither; nor C．Either; or D．Both; and ( )19．My father is always busy, so either my grandparents or my mother ________ every day. A．cook and do housework B．cooks and do housework C．cooks and does housework D．cook and does housework ( )20．—Mom, can I have the pink skirt and the white shirt? I like them very much. —Sorry, baby. They cost too much, but you can choose ________ the skirt ________ the shirt. A．both; and B．either; or C．neither; nor D．not only; but also ( )21．We haven’t decided ________ we will go to the park by bike or by bus this Sunday. A．how B．whether C．that D．if ( )22．We _______ Tom _______ honest boy. A．think, isn’t a B．think, isn’t an C．don’t think, is a D．don’t think, is an ( )23．Yesterday my father told me that the earth ________ around the sun. A．moved B．moves C．was moving D．has moved ( )24．My geography teacher told us ________ Japan ________ an island country. A．that; was B．that; is C．if; was D．if; is ( )25．—What did your father ask you just now? —He asked me ________. A．when would I go home B．where I am with my friends C．whom I was chatting with D．what was I interested in ( )26．Most kids are interested in amazing things. They often wonder ________. A．how do elephants have long noses B．that they will see UFOs in the future C．where can they discover treasures D．why there are no trees living without light ( )27．—Could you tell me ______? —It helps me a lot in learning new skills. A．how you use DeepSeek B．why you like to use DeepSeek C．how do you use DeepSeek D．why do you like to use DeepSeek ( )28．If you don’t know ________, please call me. A．how to do B．how to do it C．what to do it D．what can you do ( )29．Could you please tell me ________ I can improve my understanding of poems? A．what B．how C．which D．that ( )30．—Here is some news about Wuxi Metro Line S2: all the underground stations in the Yixing section have entered a new stage. Have you heard of it? —Sounds great. I wonder ________. A．how soon will it be open to the public B．how soon it will be open to the public C．how long will it be open to the public D．how long it will be open to the public ( )31．—I want to make some milkshakes. Could you tell me ________? —Sorry, I’ve never used one before. Why not read the instructions first? A．where can I buy a blender B．where I can buy a blender C．how can I turn the blender on D．how I can turn the blender on ( )32．The classical Chinese poem “If you’ll enjoy a greater sight, you’d climb up to a greater height” tells us ________. A．what we can enjoy B．what are we good at C．how can we work hard D．how we can open our minds ( )33．— Could you please tell me ________ I can find a book on Chinese culture? — Walk ahead till you reach the fifth stand. A．why B．when C．whether D．where ( )34．—Could you tell me ________ about the attractions in Wuxi? —I think crtt.wuxi.gov.cn will help. A．what information I can find B．how can I find the information C．where I can find the information D．that I can find the information ( )35．—It’s so late. Why not write the report tomorrow? —But I don’t know ________ I can do it if not now. A．why B．how C．when D．where ( )36．—After the P. E. class, the teacher asked ________. —It must belong to Lily. She was looking for her jacket on the playground. A．whose jacket was it B．whose jacket it was C．where did the student put the jacket D．where the student put the jacket ( )37．—Do you know ________? —Sorry, I don’t know. A．whose book is this B．whose book this is C．who’s book this is D．who’s book is this ( )38．There are so many nice gifts in the shop. I don’t know ________. A．which I should buy one B．which one should I buy C．which one to choose D．which I should to choose ( )39．—I’d like to buy a new jacket, but I don’t know ________. —How about this one? A．which should I choose B．which I should choose C．where I can get it D．where can I get it ( )40．—Hi, Jack. Do you know ________? I want to thank him or her in person. —No, it was just left on the front desk. A．who sent my wallet back B．where did they find my wallet C．how much money was in my wallet D．whose wallet is this ( )41．—Do you know ________ when you are in trouble? —Yes. I can ask my parents, friends or anybody I trust. A．who can you ask for help B．who you can ask for help C．how can you ask for help D．how you can ask for help ( )42．The student completed this experiment to make come true ______ Professor Joseph had said. A．that B．what C．when D．where ( )43．—Jack will have a birthday party tomorrow. Do you know ________? —I’m not sure. Let’s call Cathy and she may know something about it. A．how can I get there B．why didn’t he invite me C．what gift he prefers D．where the party was held ( )44．—Sorry, I was not paying attention. What did you say? —I said I wasn’t sure ________. A．that it would be Tom’s birthday tomorrow B．whether Tom would arrive on time or not C．what the matter was with Tom D．what was Tom’s school number ( )45．—Let’s go climbing if it ________ next Saturday. —Good idea. But nobody knows if it ________. A．is fine; rains B．is fine; will rain C．will be fine; rains D．will be fine; will rain ( )46．— We are still discussing ________we will go to Tina’s party tomorrow or not. — If we ________, we’ll go. A．whether; invite B．if; will invite C．whether; are invited D．whether; will be invited ( )47．—Tom, why do people say “Better late than never”? —Because it encourages us by saying ________. A．how can we avoid being late B．that a late start still matters C．why we should be on time D．when is the best time to arrive ( )48．The students hope ________ the final project successfully before the summer vacation. A．they will finish B．them to finish C．finishing D．themselves to finish ( )49．Jim believes ________ students should spend more time studying. A．whether B．that C．if D．what ( )50．His words remind me _______ we did together during the past holiday. A．that B．of that C．of what D．what 二、用所给单词的适当形式填空（共35小题；每小题1分，满分35分） 用括号中所给单词的适当形式填空，使句意完整。 1．Both my mother and I ________ (shop) online right now. 2．At this time yesterday, everyone except Tom and John ________ (practise) playing basketball on the playground. 3．Everyone except Tom and Sam ________ (fall) asleep already. 4．—Where is Mrs. Green? —She as well as her daughters ________ (fly) back to their hometown for Christmas. 5．While Tom as well as his classmates ________ (clean) the windows, they heard loud thunder. 6．You’d better not make noise. Not only the twins but their father ________ (plan) the coming holiday. 7．Not only the twins but also Jack ________ (choose) without any doubt to be volunteers last week. 8．Remember, neither your animal sign nor your star sign ________ (shape) your life and future. 9．Neither I nor my cousin ________ (be) to Shanghai Disneyland Park. How we wish to get there some day! 10．Either I or my sister ________ (ride) a bike to go to school because we only have one bike. 11．I think you _______________ (make) many friends during the sports meet. 12．The Physics teacher told us that water ________ (change) into ice at the temperature of 0℃. 13．Mr. Smith told the young children that the Earth ________ (circle) the Sun once every 365 and a quarter days. 14．The teacher told his class that light________ （travel） faster than sound. 15．—Who is the lady at the gate? —Mrs Black. I thought you ______________ (know) her. 16．He asked me if I ______ (go) fishing that afternoon. 17．No one knew then that it ________ (take) us a long time to fight against the virus. 18．Jane said she ________ staying at home alone to going out together with others. (prefer) 19．I thought I ________ (finish) my task today, but there is still a lot left to do. I’m going crazy. 20．The director said that the film ________ (basic) on the things of everyday life. 21．Wang Hong wondered if she ________ (come) to see him in five days. 22．The company expected that ChatGPT ________ (change) the way people work and live. 23．He wondered why she ________ to take her advice. (choice) 24．My father told me that we ________ a big family party the next day. (have) 25．She promised she ________ (return) the book to me the next day, but she didn’t. 26．—I hear Leo arrived last night. —Too good to be true. I never thought he ________ (come) so early. 27．With your help and cheers, I believe we ________ (win) the game. 28．Nancy is not sure whether she ________ (shut) all the windows just now. 29．I hope China Dream ________ (come) true some day. 30．Could you tell me when you ________ (create) a new song? We are looking forward to it. 31．Do you know if he ________ (see) the film before? 32．No one knows exactly when the dinosaurs ________ (death) out. 33．—Why not look at page 20 of your English book? —Ah, here the key is! I wonder why I ________ (not think) of this. 34．The boy asks whether there ________ (be) little clean water for people to drink in the future. 35．Our teacher hopes the safety tips which he suggests ________ (protect) us against danger. 三、句型转换（共15小题；每小题1分，满分15分） 按要求改写下列句子，每空一词。 1．Leo is 12 years old. I am 12 years old too. (改为同义句) ________ Leo and I ________ 12 years old. 2．Ariana Grande is not only a singer, but also an actress. (保持句意基本不变) Ariana Grande is an actress ________ ________ as a singer. 3．Mary is good at swimming. She is good at running as well.（同义句） Mary is good at ________ ________ swimming, ________ ________ running. 4．Both Lily and Lucy have seen the great scene. (改成完全否定句) _______ Lily _______ Lucy _______ seen the great scene. 5．My parents don’t like skating and my sister doesn’t like skating, either. (改为同义句) ________ my parents nor my sister ________ skating. 6．I can’t afford the time as well as the money for a trip. (保持句意基本不变) I can afford ________ the time ________ the money for a trip. 7．Lily plays the piano. You play the piano. (用either…or改写句子) ___________ you ___________ Lily ___________ the piano. 8．We can go hiking this weekend, and we can also go camping. Both are good choices. ________ going hiking ________ going camping this weekend is a good choice. 9．Could you tell me where to get some medicine? (改为同义句) Could you tell me where ________ ________ get some medicine? 10．They wanted to know what they should do to help the sick children. (改为同义句) They wanted to know ________ ________ do to help the sick children. 11．I think we should look for another hotel to live in. (改为否定句) I ________ ________ we ________ look for another hotel to live in. 12．Does the earth go around the sun? Susan wanted to know.(合并为一句) Susan wanted to know _______ the earth _______ around the sun. 13．“What do you sell online” I asked the young boy. (保持句意基本不变) I asked the young boy ________ he ________ online. 14．Does she work hard? The teacher asks. (合并为宾语从句) The teacher asks ________ ________ ________ hard. 15．“Can I borrow your pen?” Tom asked me. (改为同义句) Tom asked me ________ he ________ borrow my pen. 学科网（北京）股份有限公司 $ 答案解析 一、单项选择（50题） 1. 答案：B。解析：neither…nor…意为“既不……也不……”；either…or要么…要么；both…and两者都；not only…but also不仅…而且。答句说你年纪太小安全第一，说明老师和父母都不允许我独自游泳，用neither nor。 2. 答案：A。解析：固定搭配neither…nor…，表示“两者都不”，句意为Tony和我都对打游戏不感兴趣。 3. 答案：B。解析：not only…but also遵循就近原则，谓语动词likes为三单，靠近主语her children；both and后谓语用复数；as well as谓语随前面主语；All不能接Auntie Jane单数。 4. 答案：C。解析：not only…but also就近原则，靠近主语I，be动词用am。 5. 答案：A。解析：neither nor就近原则，靠近主语I，一般现在时谓语用原形break。 6. 答案：D。解析：either…or二选一；both两者都。句意：你可以拿这本或那本杂志，但不能两本都拿走。neither nor两者都不不符合前半句；not only but also表并列，不符合选择语境。 7. 答案：B。解析：either or就近原则，靠近主语I，be动词用am。 8. 答案：A。解析：doubt后宾语从句，肯定句用that引导，I have no doubt that…我毫不怀疑……；if/whether用于否定/疑问doubt后；what不作连词。 9. 答案：B。解析：be sure后陈述句宾语从句用that引导，句意我确定我们队会赢。 10. 答案：B。解析：both…and后谓语动词用复数are；not only…but also/either or/neither nor就近原则，谓语看后主语。句中谓语are，只能用both and。 11. 答案：A。解析：both…and两者都，后谓语复数want；either or/neither nor就近谓语单数；D搭配错误无either and。 12. 答案：A。解析：except遵循就远原则，主语All the students复数；since引导时间段，leave短暂动词，since后用现在完成时have left；be away需搭配时间段，此处无时长描述，用have left。 13. 答案：A。解析：as well as遵循就远原则，谓语随前面Mr. White单数；and连接两个主语谓语复数；but/except语义不符。 14. 答案：C。解析：as well as就远原则，主语He单数，现在进行时is watching。 15. 答案：A。解析：not only…but also就近原则，靠近主语her teammates复数，一般现在时谓语用原形train。 16. 答案：C。解析：not only…but also就近原则，谓语likes三单靠近my brother；both and后谓语复数；neither nor语义不符；All不能接两个人。 17. 答案：C。解析：neither…nor两者都不，后文So pity太可惜，说明老师和学生都不知道答案；both and两者都；either or二选一；not only but also不仅而且。 18. 答案：C。解析：either…or要么你要么Daniel今晚完成报告；答句为什么不两个人一起，说明只需要一人完成；not only but also两者都；neither nor两者都不；both and两者都。 19. 答案：C。解析：either or就近原则，靠近my mother三单，and并列两个谓语都用三单cooks and does。 20. 答案：B。解析：either…or二选一，妈妈说太贵只能选裙子或衬衫；both and两者都；neither nor两者都不；not only but also并列。 21. 答案：B。解析：whether…or not固定搭配，宾语从句表“是否”；if不能直接和or not连用放此处；how如何；that无含义。 22. 答案：D。解析：think否定前移，主句don’t think；honest元音音素开头用an。 23. 答案：B。解析：宾语从句表述客观真理地球绕太阳转，永远用一般现在时moves，不受主句过去时影响。 24. 答案：B。解析：that引导陈述句宾语从句；日本是岛国为客观事实，从句用一般现在时is。 25. 答案：C。解析：宾语从句必须陈述语序，排除A、D疑问语序；主句asked一般过去时，从句时态倒退，B am错误，C陈述语序且was符合过去时。 26. 答案：D。解析：宾语从句陈述语序，A、C疑问语序排除；wonder后表疑问不用that引导，D语序正确语义通顺。 27. 答案：B。解析：宾语从句陈述语序排除C、D；答句It helps me a lot讲作用，问句询问原因why。 28. 答案：B。解析：how to do it如何做这件事，do后必须加宾语it；what to do不用加it；D疑问语序错误。 29. 答案：B。解析：how如何，句意你能告诉我怎样提升诗歌理解吗；what什么；which哪一个；that无实义。 30. 答案：B。解析：宾语从句陈述语序排除A、C；how soon多久以后，用于将来时提问开放时间；how long多长时间，询问时长。 31. 答案：D。解析：宾语从句陈述语序排除A、C；答句从没使用过，询问如何打开搅拌机，选how。 32. 答案：D。解析：宾语从句陈述语序排除B、C；诗句欲穷千里目更上一层楼告诉我们如何开阔眼界，选how。 33. 答案：D。解析：答句指路走到第五个书架，问句询问地点where。 34. 答案：C。解析：宾语从句陈述语序排除B；答句给出网站，询问在哪里查找信息where。 35. 答案：C。解析：句意如果现在不做，我不知道什么时候能做；why为什么；how怎样；where哪里。 36. 答案：B。解析：宾语从句陈述语序排除A、C；答句回答夹克归属，问句询问是谁的夹克whose jacket。 37. 答案：B。解析：宾语从句陈述语序排除A、D；who’s=who is，不能修饰book，用whose谁的。 38. 答案：C。解析：“疑问词+to do”固定结构which one to choose选哪一个；A多宾语one；B疑问语序；D should后用动词原形。 39. 答案：B。解析：宾语从句陈述语序排除A、D；答句推荐这件夹克，问句询问选哪一件which。 40. 答案：A。解析：宾语从句陈述语序排除B；后文要当面感谢，询问是谁归还钱包who。 41. 答案：B。解析：宾语从句陈述语序排除A、C；答句说可以找父母朋友求助，询问找谁求助who。 42. 答案：B。解析：what引导宾语从句，在从句中作said的宾语；that不作成分；when/where表状语。 43. 答案：C。解析：宾语从句陈述语序排除A、B；主句tomorrow将来时，D was held过去时错误，C什么礼物他更喜欢符合时态。 44. 答案：B。解析：be not sure后用whether引导表不确定；A that引导确定陈述；C语序应为what was the matter；D陈述语序错误。 45. 答案：B。解析：第一句if引导条件状语从句，主将从现，从句用is fine；第二句if引导宾语从句，tomorrow将来，用will rain。 46. 答案：C。解析：whether…or not固定搭配；if引导条件状语从句，我们是被邀请，被动语态are invited。 47. 答案：B。解析：宾语从句陈述语序排除A、D；Better late than never迟做总比不做好，含义迟来的努力依然有意义，that引导陈述句从句。 48. 答案：A。解析：hope后接宾语从句，不能用hope sb. to do；C finishing缺少主语；D搭配错误。 49. 答案：B。解析：that引导陈述句宾语从句，无实义不充当成分；whether/if表是否；what作宾语。 50. 答案：C。解析：固定搭配remind sb. of sth.；what引导宾语从句，在从句中作did的宾语，of what we did我们过去假期一起做的事。 二、用所给单词适当形式填空（35题） 1. 答案：are shopping。解析：both…and后谓语复数；right now现在进行时。 2. 答案：was practising。解析：except就远原则主语everyone单数；at this time yesterday过去进行时。 3. 答案：has fallen。解析：everyone单数；already现在完成时，fall过去分词fallen。 4. 答案：is flying。解析：as well as就远原则主语she单数；此刻询问位置，现在进行时。 5. 答案：were cleaning。解析：as well as谓语随前面Tom，while过去进行时，主语Tom单数修正：was cleaning。 6. 答案：is planning。解析：not only…but also就近原则father单数；前文别吵闹，正在计划，现在进行时。 7. 答案：was chosen。解析：就近Jack单数；last week过去时，主语人“被选为志愿者”被动语态。 8. 答案：shapes。解析：neither nor就近your star sign单数；客观道理一般现在时三单。 9. 答案：have been。解析：neither nor就近my cousin单数；have been to去过某地，后文wish说明还没去过。 10. 答案：rides。解析：either or就近my sister单数；只有一辆自行车，常态一般现在时三单。 11. 答案：will make。解析：运动会还未发生，将来时，你会交到很多朋友。 12. 答案：changes。解析：水零度结冰客观真理，宾语从句永一现。 13. 答案：circles。解析：地球绕太阳客观真理，一般现在时三单。 14. 答案：travels。解析：光比声音快客观真理，三单。 15. 答案：knew。解析：主句thought一般过去时，宾语从句时态倒退，know过去式knew。 16. 答案：would go。解析：主句asked过去时，that afternoon当天下午，过去将来时would go。 17. 答案：would take。解析：主句knew过去时，对抗病毒是将来会花费很久，过去将来时。 18. 答案：preferred。解析：固定搭配prefer doing to doing；主句said过去时，从句prefer过去式preferred。 19. 答案：would finish。解析：主句thought过去时，原计划今天完成，过去将来时。 20. 答案：is based。解析：固定短语be based on基于；主句said陈述客观事实，一般现在时被动。 21. 答案：would come。解析：主句wondered过去时，in five days五天后，过去将来时would come。 22. 答案：would change。解析：主句expected过去时，未来会改变，过去将来时。 23. 答案：chose。解析：choice名词，此处缺谓语动词choose；主句wondered过去时，choose过去式chose。 24. 答案：would have。解析：主句told过去时，the next day第二天，过去将来时。 25. 答案：would return。解析：promised过去时，the next day次日归还，过去将来时。 26. 答案：would come。解析：主句thought过去时，过去将来时。 27. 答案：will win。解析：believe后宾语从句，未来比赛用一般将来时。 28. 答案：shut。解析：just now刚才，一般过去时，shut过去式同原形shut。 29. 答案：will come。解析：some day将来某天，一般将来时come true实现。 30. 答案：will create。解析：后文look forward期待新歌，还未创作，将来时。 31. 答案：has seen。解析：before用于现在完成时，他之前是否看过电影。 32. 答案：died。解析：death名词，谓语用动词die；恐龙灭绝是过去，过去式died，die out灭绝。 33. 答案：didn’t think。解析：说话前没想起来，过去时否定didn’t+动词原形。 34. 答案：will be。解析：in the future将来，there be将来时there will be。 35. 答案：will protect。解析：hope后从句，未来安全提示会保护我们，将来时。 三、句型转换（15题） 1. 答案：Both; are。解析：both…and两者都，主语两个人，be动词用are。 2. 答案：as well。解析：as well as固定短语，等同于not only…but also，意为“也、同时”。 3. 答案：not only; but also。解析：not only…but also同义替换as well，两者都擅长游泳和跑步。 4. 答案：Neither; nor; has。解析：both and完全否定用neither nor；就近Lucy单数，现在完成时助动词has。 5. 答案：Neither; likes。解析：neither nor就近my sister单数，一般现在时谓语三单likes。 6. 答案：neither; nor。解析：原句没时间也没钱旅行，neither…nor两者都不。 7. 答案：Either; or; plays。解析：either or就近后主语Lily单数，谓语三单plays。 8. 答案：Either; or。解析：二选一，两者任意一个都是好选择，either or作主语谓语单数is。 9. 答案：I can。解析：疑问词+to do = 疑问词+主语+can do陈述语序。 10. 答案：what to。解析：what they should do = what to do，宾语从句简化为疑问词+to do。 11. 答案：don’t think; should。解析：think否定前移，主句加don’t，从句不变。 12. 答案：if/whether; goes。解析：一般疑问句变宾语从句用if/whether；地球绕太阳客观真理，从句一般现在时三单goes。 13. 答案：what; sold。解析：直接引语一般现在时变间接引语，主句asked过去时，sell变sold；what引导宾语从句陈述语序。 14. 答案：if/whether she works。解析：一般疑问句合并宾语从句用if/whether，陈述语序，主语she三单works。 15. 答案：if/whether; could。解析：一般疑问句变宾语从句用if/whether；主句asked过去时，can变could。 学科网（北京）股份有限公司 $