Units 1-4 语法专项练2026-2027学年人教版九年级英语上册

该初中英语讲义通过表格对比、框架梳理系统构建Units 1-4语法知识体系，将现在完成时与一般过去时、used to do等核心语法点按“规则解析-易错提醒-实例应用”递进呈现，用对比表清晰呈现语法差异，思维导图式梳理知识内在联系，突出重难点分布。 讲义亮点在于“分层精练+方法指导”设计，如现在完成时与一般过去时对比练习（例1-3）、宾语从句语序专项题（例12），培养语言能力和思维品质。每个语法点配易错点提示（如现在完成时不与明确过去时间连用），基础学生掌握规则，优秀学生深化辨析，助力教师实施精准教学，支持学生自主复习。

Units 1-4 语法专项精练（精编版） 2026-2027学年 人教版（2024）九年级英语上册 Unit 1 The Changing World 语法精讲与精练 本单元核心语法：现在完成时与一般过去时的用法对比；used to do / be used to doing / be used to do 辨析。 一、现在完成时 vs 一般过去时 【核心规则】现在完成时（have/has + 过去分词）强调过去动作对现在的影响或持续至今的状态；一般过去时仅描述过去某时发生的动作或状态，与现在无关。 对比项 一般过去时 现在完成时 核心含义 过去某时发生的动作或状态 过去动作对现在的影响或持续至今 时间状语 yesterday, last week, in 2015, ago 等明确的过去时间 already, yet, just, ever, never, since+时间点, for+时间段 与现在关系 与现在无关 与现在有密切关联 动作是否结束 动作已结束 可能已结束（影响现在）或仍在继续 例句 I lived here in 2015.（仅描述过去） I have lived here since 2015.（持续至今） 【易错点】现在完成时不能与明确的过去时间状语（如 yesterday, last week, in 2020, three days ago 等）连用。例如：I have bought a book yesterday.（×）→ I bought a book yesterday.（√） 【重点】have been to / have gone to / have been in 辨析：have been to sp. 表示"去过某地"（已回来）；have gone to sp. 表示"去了某地"（还没回来）；have been in sp. + 时间段 表示"在某地待了多久"。 例1 —______ you ______ (visit) the National Museum? —Yes. I ______ (go) there last weekend. 【解析】第一空询问经历，用现在完成时 Have ... visited；第二空有明确过去时间 last weekend，用一般过去时 went。 【答案】Have; visited; went 例2 Great changes ______ in my hometown in the past few years. A. took place B. have taken place C. take place D. will take place 【解析】时间状语 in the past few years（在过去的几年里）是现在完成时的标志词，强调从过去持续到现在的变化。take place 无被动形式，直接用现在完成时 have taken place。 【答案】B 例3 —Where is Mr. Wang? —He ______ the library. He will be back in an hour. A. has been to B. has gone to C. has been in D. went to 【解析】根据 He will be back in an hour（他一小时后回来）可知王先生还没回来，说明"去了某地（还没回来）"，用 has gone to。 【答案】B 【专项练习】 1. I ______ (lose) my key. I cannot open the door now. 【答案】have lost 2. She ______ (visit) Paris in 2019 and ______ (be) there twice since then. 【答案】visited; has been 3. —______ you ever ______ (eat) Italian food? —Yes, I have. I ______ (try) it last month. 【答案】Have; eaten; tried 4. The old building ______ (pull) down last year, and a new park ______ (build) there already. 【答案】was pulled; has been built 5. My brother ______ the army for three years. He ______ the army in 2023. 【答案】has been in; joined 6. —How long ______ you ______ (study) English? —For about six years. I ______ (start) in Grade 3. 【答案】have; studied; started 7. So far, we ______ (learn) more than 2,000 English words. 【答案】have learned 8. I ______ (read) the novel last week. It ______ (be) very interesting. 【答案】read; was 二、used to do / be used to doing / be used to do 辨析 结构 含义 to 词性 例句 used to do sth. 过去常常做某事（现在不做了） 不定式符号 I used to play basketball after school. be/get used to doing sth. 习惯于做某事 介词 I am used to getting up early. be used to do sth. 被用来做某事（被动语态） 不定式符号 Knives are used to cut things. 【易错点】be used to doing 中的 to 是介词，后面必须接动名词（doing），不能接动词原形！例如：I am used to get up early.（×）→ I am used to getting up early.（√） 【重点】used to 的否定形式：didn't use to do 或 usedn't to do；疑问形式：Did ... use to do? 或 Used ... to do? 例4 There ______ a small river in front of my house, but now it has become a road. A. used to be B. used to have C. was used to be D. used to being 【解析】表示"过去有"（现在没有了），用 There used to be 结构。There be 句型表示"存在有"，不能用 have。used to 后接动词原形 be。 【答案】A 例5 My grandfather is used to ______ (take) a walk after dinner every day. 【解析】be used to doing sth. 表示"习惯于做某事"，to 是介词，后接动名词。take → taking。 【答案】taking 【专项练习】 9. He used to ______ (be) shy, but now he is very outgoing. 【答案】be 10. I am used to ______ (read) English every morning. 【答案】reading 11. Wood is used to ______ (make) paper and furniture. 【答案】make 12. —Did you use to ______ (play) the piano? —Yes, but now I am busy with my studies. 【答案】play 13. There used to be a cinema here, ______?（完成反意疑问句） 【答案】didn't there / usedn't there 14. She has got used to ______ (live) in the city though she grew up in the countryside. 【答案】living 【Unit 1 综合练习】 15. In the past few years, AI ______ (develop) rapidly and ______ (change) our lives greatly. 【答案】has developed; has changed 16. —______ you ______ (finish) your homework yet? —Yes. I ______ (finish) it an hour ago. 【答案】Have; finished; finished 17. My father ______ (teach) in this school since 2010. He ______ (start) here 16 years ago. 【答案】has taught; started 18. She used to ______ (walk) to work, but now she is used to ______ (drive). 【答案】walk; driving 19. Great changes ______ (take) place in our city since 2020. More parks ______ (build) so far. 【答案】have taken; have been built Unit 2 Inspiring People 语法精讲与精练 本单元核心语法：It is + adj. + of/for sb. + to do sth.；强调句型；The reason why... is that...；被动语态表评价。 一、It is + adj. + of/for sb. + to do sth. 【核心规则】It is + adj. + of sb. + to do sth.：形容词描述人的品质（brave, kind, clever, wise, careless 等），of 后的人称可与前面的形容词构成主系表结构（sb. is adj.）。It is + adj. + for sb. + to do sth.：形容词描述事情的特征（important, necessary, difficult, easy, hard 等），for 后的人称不能与形容词构成主系表结构。 句型 形容词类型 判断方法 例句 It is + adj. + of sb. + to do 描述人品质（brave, kind, clever 等） sb. is adj. 成立 It is brave of her to face the challenge. It is + adj. + for sb. + to do 描述事情（important, hard, necessary 等） sb. is adj. 不成立 It is important for us to learn English well. 【易错点】判断用 of 还是 for，最简单的方法：把句子改写为 "sb. is adj."，如果通顺合理就用 of，不通顺就用 for。例如：She is brave.（通顺→用 of）；We are important.（不通顺→用 for）。 例6 It is very kind ______ you to help me with my English. A. for B. of C. to D. with 【解析】kind 描述人的品质，"You are kind." 通顺合理，所以用 of。句意：你能帮我学英语真是太好了。 【答案】B 例7 It is necessary ______ us ______ good learning habits. A. of; to develop B. for; to develop C. of; developing D. for; developing 【解析】necessary 描述事情而非人品质，"We are necessary." 不通顺，用 for。后面的不定式作真正主语，用 to develop。 【答案】B 【专项练习】 20. It is clever ______ him to work out the maths problem so quickly. 【答案】of 21. It is difficult ______ me ______ (finish) the work in two days. 【答案】for; to finish 22. It was brave ______ the girl ______ (save) the drowning child. 【答案】of; to save 23. It is important ______ students ______ (take) notes in class. 【答案】for; to take 24. It is careless ______ you ______ (leave) your bag on the bus. 【答案】of; to leave 二、强调句型：It is/was + 被强调部分 + that/who... 【核心规则】强调句用于强调句子中的某个成分（主语、宾语、状语等）。结构：It is/was + 被强调部分 + that/who + 句子剩余部分。强调人时可用 who 或 that，强调物或状语时用 that。判断方法：去掉 It is/was 和 that/who 后，剩余部分仍能构成完整句子。 【重点】强调句的一般疑问句：Is/Was it + 被强调部分 + that...？ 强调句的特殊疑问句：疑问词 + is/was it + that...？ 例8 It was in the library ______ I met Mr. Li yesterday. A. that B. where C. which D. when 【解析】强调地点状语 in the library，用 that。验证方法：去掉 It was 和 that，剩余 "in the library I met Mr. Li yesterday" 仍是完整句子。 【答案】A 例9 It is his courage and determination ______ make him an inspiring person. A. that B. what C. which D. who 【解析】强调主语 his courage and determination，且该主语指"品质"（非人），用 that。注意：强调主语时，that 后的谓语动词应与被强调的主语保持一致。 【答案】A 【专项练习】 25. It was because of his hard work ______ he achieved his goal. 【答案】that 26. It was last summer ______ I visited the Great Wall with my family. 【答案】that 27. ______ was it ______ you bought the book?（强调疑问句） 【答案】When; that 28. It is the teacher ______ inspires us to never give up.（强调人，用who/that） 【答案】who/that 29. It was not until he came back ______ I left.（直到……才……的强调形式） 【答案】that 三、The reason why... is that... / 被动语态表评价 【核心规则】The reason why + 结果/行为 + is that + 原因。注意：用 that 不用 because，因为主语已有 reason，再用 because 语义重复。 【被动语态表评价】常见结构：sb. be considered (to be) + n./adj.（被认为……）；sb. be remembered as + n.（作为……被铭记）；sb. be recognized for + n.（因……被认可）。 【易错点】The reason why... is that... 中，引导词必须用 that，不能用 because！因为 reason 和 because 语义重复。例如：The reason why I admire her is because she is brave.（×）→ The reason why I admire her is that she is brave.（√） 例10 The reason ______ I admire Yuan Longping is ______ he devoted his life to solving the food problem. A. why; because B. that; that C. why; that D. that; because 【解析】第一空：先行词 reason 后用 why 引导定语从句，修饰 reason。第二空：表语从句解释 reason 的内容，用 that（不能用 because，避免与 reason 语义重复）。 【答案】C 【专项练习】 30. The reason ______ he failed the exam is ______ he was too careless. 【答案】why; that 31. Yuan Longping ______ ______ ______ one of the greatest scientists in China.（被认为是） 【答案】is considered to be 32. The hero ______ ______ ______ his courage.（因勇敢而被铭记） 【答案】is remembered for 33. The reason ______ she inspires so many people is ______ she never gives up. 【答案】why; that 34. It is said that the writer ______ ______ ______ his novels.（因小说而被认可） 【答案】is recognized for 【Unit 2 综合练习】 35. It is wise ______ you ______ (choose) this learning method. 【答案】of; to choose 36. It was in 2023 ______ I.M. Pei ______ (pass) away.（强调时间） 【答案】that; passed 37. The reason ______ I look up to my mother is ______ she always helps others. 【答案】why; that 38. It is necessary ______ us ______ (develop) good learning habits from an early age. 【答案】for; to develop 39. Florence Nightingale ______ ______ ______ the founder of modern nursing.（被认为是） 【答案】is considered to be Unit 3 Smart Learning 语法精讲与精练 本单元核心语法：宾语从句（that / if / whether / wh- 词引导）；The + 比较级, the + 比较级；不定式作主语。 一、宾语从句（that / if / whether / wh- 词引导） 【核心规则】宾语从句三要素：①引导词 ②语序 ③时态。 原句类型 引导词 说明 例句 陈述句 that that 无词义，口语中可省略 I think (that) smart learning is important. 一般疑问句 if / whether 意为"是否"，不可省略 I wonder if/whether this method works. 特殊疑问句 wh- 词（what, who, when, where, why, how 等） 保留原疑问词，有词义 Can you tell me how I can improve my English? 【重点】【语序规则】宾语从句必须使用陈述语序！即主语 + 谓语，不能使用疑问语序（不能把助动词/情态动词/be动词放在主语前面）。 【易错点】宾语从句时态呼应规则：①主句为现在时态（一般现在时/现在完成时），从句可根据实际需要用任何时态；②主句为过去时态，从句须改为对应的过去时态（一般过去→过去完成；现在进行→过去进行；一般将来→过去将来）；③客观真理永远用一般现在时，不受主句时态影响。 【whether 与 if 的区别】以下情况只用 whether 不用 if：①后有 or not；②作介词宾语；③在不定式前（whether to do）；④从句位于句首。 例11 I don't know ______ he will come tomorrow. ______ he comes, I'll tell you. A. if; Whether B. whether; If C. if; That D. that; If 【解析】第一空：宾语从句表"是否"，用 whether 或 if 均可。第二空：此处是条件状语从句"如果他来"，只能用 If（条件状语从句不用 whether）。综合判断选 B。 【答案】B 例12 Could you tell me ______? A. where is the post office B. where the post office is C. where was the post office D. the post office is where 【解析】宾语从句必须用陈述语序（主语 + 谓语），排除 A、C。D 项语序混乱。正确语序为 where the post office is（where + 主语 + 谓语）。 【答案】B 例13 Our teacher said that the earth ______ around the sun. A. moved B. moves C. was moving D. had moved 【解析】宾语从句表示客观真理时，无论主句什么时态，从句都用一般现在时。"地球绕着太阳转"是客观真理，用 moves。 【答案】B 【专项练习】 40. I believe ______ smart learning can help us study better. 【答案】that 41. I wonder ______ this learning method is effective or not.（用whether/if） 【答案】whether 42. Can you tell me ______? A. how can I improve my English B. how I can improve my English C. how I can improved my English D. how improve my English 【答案】B 43. She asked me ______ I had finished my homework. 【答案】if/whether 44. The teacher told us that the sun ______ (rise) in the east. 【答案】rises 45. I don't know ______ to choose.（用 whether...or not 结构） 【答案】whether 46. He asked ______ the library was open on weekends. A. that B. if C. what D. which 【答案】B 47. Tom said he ______ (go) to the museum the next day. 【答案】would go 二、The + 比较级, the + 比较级（越……，越……） 【核心规则】"The + 比较级 (+ 主语 + 谓语), the + 比较级 (+ 主语 + 谓语)" 表示"越……，就越……"。两个比较级前都要加 the。 【重点】常用句型：The more you practice, the better your English will become.（你练习得越多，你的英语就会越好。） 例14 ______ you read, ______ you will understand. A. The more; the better B. More; better C. The more; better D. More; the better 【解析】The + 比较级, the + 比较级 结构中，两个比较级前都要加 the。read 的比较级是 more（因为 read 是动词，用 more 修饰），understand 的比较级是 better。 【答案】A 【专项练习】 48. ______ (much) you learn, ______ (wise) you will become. 【答案】The more; the wiser 49. ______ (careful) you are, ______ (few) mistakes you will make. 【答案】The more careful; the fewer 50. The harder you work, ______ (good) results you will get. 【答案】the better 51. ______ you practice, ______ your spoken English will be. A. More; better B. The more; the better C. The more; better D. More; the better 【答案】B 三、不定式作主语 【核心规则】动词不定式（to do）作主语时，谓语动词用单数。常用句型：It is + adj. + (for sb.) + to do sth.（it 为形式主语，不定式为真正主语）。 例15 It is helpful ______ (review) what you have learned every day. 【解析】不定式作真正主语，it 为形式主语。review 的不定式形式为 to review。句意：每天复习所学内容是有帮助的。 【答案】to review 【专项练习】 52. ______ (take) notes in class is very important for our study. 【答案】Taking / To take 53. It is necessary ______ us ______ (set) goals before we start learning. 【答案】for; to set 54. ______ (read) aloud every morning helps improve your pronunciation. 【答案】Reading / To read 【Unit 3 综合练习】 55. I think ______ a good learning method is the key to success. 【答案】that 56. Could you tell me ______ the library closes on weekends? A. when does B. when C. when did D. when is 【答案】B 57. The teacher said that light ______ (travel) faster than sound. 【答案】travels 58. ______ you practice, ______ you will become. 【答案】The more; the better 59. It is important for students ______ (develop) good learning habits. 【答案】to develop Unit 4 Our Memory 语法精讲与精练 本单元核心语法：remember/forget/stop doing vs to do 辨析；定语从句（that/which/when）；感叹句（What/How）。 一、remember / forget / stop doing vs to do 动词 doing（动名词） to do（不定式） remember remember doing sth. 记得做过某事（已完成） remember to do sth. 记得要做某事（未完成） forget forget doing sth. 忘记做过某事（已完成） forget to do sth. 忘记要做某事（未完成） stop stop doing sth. 停止正在做的事 stop to do sth. 停下来去做另一件事 例句 I remember locking the door.（我记得锁过门了） Please remember to lock the door.（记得去锁门） 【易错点】stop doing 和 stop to do 含义完全不同！Stop talking!（停止说话！）vs He stopped to take a break.（他停下来休息一下）。做题时务必根据上下文判断。 例16 Please remember ______ (turn) off the lights before you leave the classroom. 【解析】remember to do sth. 表示"记得要做某事（还未做）"。句意：离开教室前请记得关灯。灯还没关，用 to turn。 【答案】to turn 例17 The students stopped ______ (talk) when the teacher came in. 【解析】stop doing sth. 表示"停止正在做的事"。句意：老师进来时，学生们停止了说话。用 talking。 【答案】talking 【专项练习】 60. I remember ______ (meet) him at a party last year, but I forgot his name. 【答案】meeting 61. Don't forget ______ (bring) your dictionary to class tomorrow. 【答案】to bring 62. He was tired, so he stopped ______ (take) a rest. 【答案】to take 63. Please stop ______ (make) noise. The baby is sleeping. 【答案】making 64. I'll never forget ______ (visit) the Great Wall for the first time. 【答案】visiting 65. Remember ______ (review) your notes every day. It will help your memory. 【答案】to review 二、定语从句（that / which / when 引导） 【核心规则】定语从句修饰名词或代词（先行词）。关系词选择：①先行词指人 → who/that（作主语或宾语）；②先行词指物 → which/that（作主语或宾语）；③先行词指时间 → when（作时间状语）。 先行词类型 关系词 在从句中充当 例句 人 who / that 主语或宾语 The teacher who teaches us English is very kind. 物 which / that 主语或宾语 The book that/which I bought yesterday is interesting. 时间 when 时间状语 I remember the day when we first met. 【重点】关系代词 that 和 which 指物时通常可互换。但在以下情况只能用 that：①先行词是不定代词（everything, nothing, anything 等）；②先行词被最高级修饰；③先行词被 the only, the very 等修饰；④先行词既有人又有物。 【易错点】when 引导定语从句时，先行词必须是时间名词（day, time, year 等），且 when 在从句中作时间状语。如果从句中主谓宾完整，缺的是时间状语，就用 when；如果从句缺少主语或宾语，则用 that/which。 例18 This is the most unforgettable movie ______ I have ever seen. A. that B. which C. what D. who 【解析】先行词 movie 被最高级 the most unforgettable 修饰，关系代词只能用 that，不能用 which。 【答案】A 例19 I will never forget the day ______ we graduated from junior high school. A. that B. which C. when D. what 【解析】先行词 the day 是时间名词。从句 "we graduated from junior high school" 主谓宾完整，缺少的是时间状语，所以用 when。 【答案】C 【专项练习】 66. The memories ______ we share are precious. 【答案】that/which 67. This is the teacher ______ inspired me to love learning. 【答案】who/that 68. I remember the time ______ we studied together in the library. 【答案】when 69. This is the most interesting book ______ I have ever read. 【答案】that 70. The photos ______ were taken during the trip bring back happy memories. 【答案】that/which 71. Do you still remember the day ______ we first came to this school? 【答案】when 三、感叹句（What / How 引导） 【核心规则】What 引导的感叹句修饰名词：What (a/an) + adj. + n. (+ 主语 + 谓语)! How 引导的感叹句修饰形容词或副词：How + adj./adv. (+ 主语 + 谓语)! 类型 结构 例句 What + 不可数名词 What + adj. + 不可数名词 (+ 主语 + 谓语)! What unforgettable memories we have! What + 可数名词单数 What a/an + adj. + 可数名词单数 (+ 主语 + 谓语)! What a wonderful day it is! What + 可数名词复数 What + adj. + 可数名词复数 (+ 主语 + 谓语)! What beautiful flowers they are! How + 形容词/副词 How + adj./adv. (+ 主语 + 谓语)! How time flies! 【易错点】判断用 What 还是 How 的关键：看感叹部分后面是名词还是形容词/副词。如果是名词用 What，如果是形容词或副词用 How。 例20 ______ unforgettable memories we have made together! A. What B. What an C. How D. What a 【解析】memories 是可数名词复数，用 What 修饰，不需要冠词 a/an。句意：我们一起创造了多么难忘的回忆啊！ 【答案】A 【专项练习】 72. ______ a beautiful song it is! 【答案】What 73. ______ fast the technology is developing! 【答案】How 74. ______ wonderful news you have brought us! 【答案】What 75. ______ carefully the students are listening to the teacher! 【答案】How 【Unit 4 综合练习】 76. I remember ______ (lock) the door before I left. So it must be locked now. 【答案】locking 77. This is the most precious memory ______ I have ever had. 【答案】that 78. ______ an inspiring person she is! She never gives up no matter what happens. 【答案】What 79. He stopped ______ (smoke) for his health last year. 【答案】smoking 80. I will never forget the day ______ I won the first prize in the speech contest. 【答案】when Units 1-4 综合演练 本部分综合考查 Units 1-4 全部语法知识点，共 20 题，含详细解析与答案。 一、单项选择（每题2分，共30分） 1. In the past few years, great changes ______ in our city. A. took place B. have taken place C. take place D. will take place 【答案】B。时间状语 in the past few years 是现在完成时标志词，选 B。take place 无被动形式。 2. He used to ______ to school, but now he is used to ______ a bike. A. walk; ride B. walking; riding C. walk; riding D. walking; ride 【答案】C。used to do（过去常常）后接动词原形 walk；be used to doing（习惯于）后接动名词 riding。 3. —______ you ever ______ to Beijing? —Yes. I ______ there last summer. A. Have; been; went B. Have; gone; went C. Did; go; have been D. Have; been; have gone 【答案】A。第一空询问经历用 have been to；第三空有明确过去时间 last summer 用 went。 4. It is very kind ______ you to help me with my English. It is important ______ me to learn it well. A. of; of B. for; for C. of; for D. for; of 【答案】C。kind 描述人品质用 of；important 描述事情用 for。 5. It was not until he came back ______ I told him the truth. A. that B. when C. which D. what 【答案】A。强调句型，强调 not until he came back，用 that。 6. I wonder ______ he will attend the meeting tomorrow. A. that B. if C. what D. which 【答案】B。宾语从句表"是否"，用 if（也可用 whether）。 7. Could you tell me ______? A. where does he live B. where he lives C. where he live D. where did he live 【答案】B。宾语从句用陈述语序，排除 A、D。主语 he 是第三人称单数，谓语用 lives。 8. The teacher said that the earth ______ around the sun. A. moved B. moves C. was moving D. had moved 【答案】B。客观真理用一般现在时，不受主句时态影响。 9. ______ you practice, ______ your English will be. A. More; better B. The more; the better C. The more; better D. More; the better 【答案】B。The + 比较级, the + 比较级 结构。 10. Please remember ______ the window before you leave. A. closing B. to close C. close D. closed 【答案】B。remember to do sth. 记得要做某事（未做），用 to close。 11. This is the most inspiring book ______ I have ever read. A. that B. which C. what D. who 【答案】A。先行词被最高级修饰，只能用 that。 12. I will never forget the day ______ I first met my best friend. A. that B. which C. when D. what 【答案】C。先行词 the day 是时间名词，从句主谓宾完整，缺时间状语，用 when。 13. ______ wonderful news you have told us! A. What B. What a C. How D. What an 【答案】A。news 是不可数名词，用 What 修饰，不加冠词。 14. The reason ______ he succeeded is ______ he never gave up. A. why; because B. that; that C. why; that D. that; because 【答案】C。第一空 why 修饰 reason；第二空 that 引导表语从句（不用 because 避免语义重复）。 15. She ______ the piano since she was six years old. A. has played B. played C. is playing D. plays 【答案】A。since 引导的时间状语从句搭配现在完成时，用 has played。 二、完成句子（每题2分，共10分） 16. The reason ______ I admire him is ______ he always helps others. 【答案】why; that。第一空 why 修饰 reason；第二空 that 引导表语从句。 17. ______ (much) you read, ______ (wise) you will become. 【答案】The more; the wiser。The + 比较级, the + 比较级 结构。 18. It is brave ______ her ______ (face) all these challenges alone. 【答案】of; to face。brave 描述人品质用 of；不定式作真正主语用 to face。 19. I remember ______ (visit) the museum with my classmates last year. 【答案】visiting。remember doing sth. 记得做过某事（已完成）。 20. Could you tell me ______ the library ______ (open) on weekends? 【答案】whether/if; opens。宾语从句表"是否"用 whether/if；陈述语序，一般现在时 opens。 学科网（北京）股份有限公司 $