内容正文:
初三下册教科版(五四制)
【语法专练】
Unit5核心突破
考点精讲
Unit 5 The Way to Success
before引导的时态先后从句专项突破
考频分析
教科版(五四制)9下中,before引导的时态先后从句是重点语法模块,考频占句法总量的15%左
右,主要分布在核心题型:单项选择(1-2题)、完形填空(2-3题)、语法填空(1-2题)、书面表达
(关键考察,直接影响句子逻辑与时间顺序)。在语境理解类题目中,主从句的时态呼应及时间关系
辨析往往是解题关键。
考查内容
知识点一:before引导的时间状语从句与主句时态搭配
1.主句为一般过去时,before从句为一般过去时(从句动作先于主句,强调动作先后顺序)
。时态逻辑:主句动作发生在过去,从句动作在主句之前完成,均用一般过去时
·结构:主句(主语+动词过去式)+before+从句(主语+动词过去式)
·例句:
l.He went to bed before he finished his homework.(“完成作业”在“上床睡觉”之前,均用过
去式finished/went)
2.They left the park before the rain started.(“雨开始”在“离开公园”之前,均用过去式started/left)
2.主句为一般将来时,before从句为一般现在时(主将从现,表将来动作先后)
。时态逻辑:主句表将来计划,从句动作在主句之前发生,用一般现在时表将来
·结构:主句(主语+will+动词原形/be going to+-动词原形)+before+从句(主语+动词原形/三
单形式)
。例句:
l.We will have dinner before he arrives.(主句将来时will have,.从句现在时arrives表“到达”
在“吃晚饭”前)
2.She is going to finish reading before the movie starts.(主句be going to finish,从句starts表“电
影开始”在“读完”前)
3.主句为现在完成时,before从句为一般过去时(强调过去动作对现在的影响)
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初三下册教科版(五四制)
【语法专练】
Unit5核心突破
·时态逻辑:主句动作持续到现在或对现在有影响,从句动作发生在过去且先于主句
●结构:主句(主语+have/has+过去分词)+before+从句(主语+动词过去式)
。例句:
I.I have never seen him before he moved to this city.(主句现在完成时表“到现在没见过”,从
句过去式moved表“搬来”的过去动作)
2.They have visited the museum three times before it closed last month.(主句完成时表“参观次
数”,从句过去式closed表“关闭”在“参观”之后)
4.主句为过去完成时,before从句为一般过去时(强调“过去的过去”的先后关系)
·时态逻辑:主句动作发生在过去某个动作之前(过去的过去),从句用一般过去时表参照的过去
时间
·结构:主句(主语+had+过去分词)+before+从句(主语+动词过去式)
·例句:
1.He had already left before I called him.(主句had left是“过去的过去”,从句called是过去参
照点)
2.The party had started before most guests arrived..(主句had started在“客人到达”arrived之前,
为过去的过去)
知识点二:before引导的时态先后从句
1.主句用一般过去时,从句用过去完成时(先于主句动作)基础用法(中考必背):
·主句动作发生在从句之后→例句:He left the room before I had finished my sentence.(我还没说
完话,他就离开了房间。)
·从句动作强调“已完成”→例句:he realized she had lost her key before she got home.(在她到
家之前,她就意识到钥匙丢了。)
。时间顺序对比→例句:They had sold out all the tickets before we arrived at the cinema.(我们到电
影院之前,他们已经卖完了所有票。)
2.主句用一般将来时,从句用一般现在时(主将从现)基础用法(中考核心):
。表将来计划→例句:I will call you before I leave for Beijing.(我去北京之前会给你打电话。)
·条件性时间→例句:She will finish her homework before her parents come back.(她会在父母回来
之前完成作业。)
。日常安排→例句:We will have a picnic before the sun sets.(太阳落山前我们要去野餐。)
3.主句和从句均用一般过去时(动作紧接发生)特殊用法(中考易错):
·强调动作先后紧密→例句:He closed the door before I could say”goodbye”.(我还没来得及说“再
见”,他就关上了门。)
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初三下册教科版(五四制)
【语法专练】
Unit5核心突破
。描述过去习惯一例句:Before he went to bed,.he always read a book.(他以前睡觉前总是看会儿
书。)
。时间间隔极短→例句:The bell rang before the teacher finished the lesson.(老师还没讲完课,铃
就响了。)
考法精析
考法一:before引导的主从句时态匹配
核心:根据主从句动作的先后顺序及语境,判断主句和从句的正确时态(如“主将从现”“主过从
过”“主现完从过”等规则)
真题1(语法填空):
She_(finish)her homework before she_(watch)TV last night.
答案:finished;watched
解析:由时间标志词“1 ast night”可知主从句均为过去动作,“完成作业”先于“看电视”发生,主
从句均用一般过去时,finish的过去式为finished,watch的过去式为watched。
真题2(单选题):
We_the party before itto rain.
A.will start;will begin B.start;begins C.will start;begins D.started;begins
答案:C
解析:从句动作“下雨”发生在主句“开始派对”之前,遵循“主将从现”原则,主句用一般将来
时will start,从句用一般现在时begins(主语it为三单)。
考法二:before从句时态综合运用
核心:结合语境判断before主从句动作的先后顺序,选择正确时态(一般过去时/一般现在时/现在
完成时等)
真题1(语法填空):
She_(finish)her homework before she_(watch)TV last night.
答案:finished;watched
解析:由时间标志词“1 ast night”可知主从句均为过去动作,“完成作业”在“看电视”之前,主从
句均用一般过去时,finish的过去式为finished,watch的过去式为watched。.
真题2(完形填空):
We_(not leave)here before the rain-(stop).
A.won't leave:stops B.don't leave;will stop C.didn't leave;stopped D.haven't left;stops
答案:A
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初三下册教科版(五四制)
【语法专练】
Unit5核心突破
解析:语境强调“雨停之前不离开”,主句表将来用一般将来时won't leave,从句遵循“主将从现”
用一般现在时stops,.故选A。
考法三:before引导的时间状语从句时态与特殊句型综合应用
核心:结合主句与从句的动作先后关系选择正确时态,掌握从句置于句首及省略主语的特殊句型
结构
真题1(单项选择):
Before-to the cinema my mother reminded me to take the tickets
A.go B.going C.went D.to go
答案:B
解析:before引导时间状语从句时,当主从句主语一致且从句谓语含be动词时可省略主语和be动
词,此处完整形式为'Before I was going to the cinema',省略后用going符合”before+doing”结构。
真题2(语法填空):
He_(finish)his homework before his parents_(come)back yesterday
答案:had finished came
解析:从句”父母回来”是过去时间参照点(一般过去时came),主句”完成作业”发生在”回来”之
前,属于”过去的过去”,用过去完成时had finished,.符合”过去完成时+before+一般过去时”的时
态搭配规则。
解题小妙招
before主从时态妙,先后顺序是首要:
时间标志先找到,last night一般过:
主将从现要记牢,主句将来从现表:
主过从过也常见,过去动作纷出现:
特殊句型主省略,动名词形跟着变:
翻译多义要灵活,“趁还没”来体现。
真题演练
演练一:单项选择试题(共10题)
1.She_to the library before she went home yesterday.
A.go B.goes C.went D.will go
2.Wedinner before my father comes back tonight.
A.have B.will have C.had D.have had
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初三下册教科版(五四制)
【语法专练】Unit5核心突破
3.Hethis song many times before he_it at the party last week.
A.hears;sang B.heard;sang C.has heard;sang D.will hear;sings
4.Before Tom_to bed,he always brushes his teeth.
A.go B.goes C.will go D.went
5.They_for an hour before the bus finally-this morning.
A.wait;arrive B.waited;arrived C.have waited;arrived D.will wait;arrives
6.I_never_such a funny story before I read this book.
A.have;read B.had;read C.read;read D.will;read
7.She_us a story before sheto bed tonight.
A.tells;goes B.will tell;goes C.told;went D.has told;went
8.Before-the room,please close the window.
A.leave B.leaving C.left D.will leave
9.He_basketball before he finished his homework yesterday.(逻辑纠错题)
A.plays B.played C.has played D.will play
10.Wethe project before the teacher-us the new task next Monday.
A.finish;gives B.will finish;gives C.finished;gave D.have finished,gives
演练二:填空试题(共10题)
1.He(eat)breakfast before he_(go)to school this morning.
2.My mother _(cook)dinner before my father(come)back yesterday.
3.We_(visit)the Great Wall before we_(leave)Beijing last summer.
4.She_(call)me before she_(fly)to Shanghai tomorrow.
5.I_(never see)snow before I_(move)to Harbin in 2020.
6.Before you_(cross)the road,you must look left and right.
7.They_(wait)for 30 minutes before the train _(arrive)just now
8.He_(keep)the book for two weeks before he_(return)it to the library yesterday
9.Before_(enter)the cinema,please show your ticket.
10.We _(not start)the meeting before the manager_(arrive)tomorrow.
演练三:语法填空试题(共10空)
阅读短文,在空白处填入括号内单词的正确形式。
Tom is a student in Grade 9.Last weekend,he planned to finish his homework before he _(go)out to
play.However,he_(watch)TV first and forgot the time.Before his mother_(come)back,he_(not
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初三下册教科版(五四制)
【语法专练】
Unit5核心突破
finish)even half of his homework.His mother was angry and said,"You must finish it before you_(go)
to bed tonight!”
This morning,Tom toldhis friend,"I_(never make)such a mistake beforeI-(realize)the importance of
time yesterday.Now,he promises that before he_(do)anything else,he_(always finish)his homework
first.His teacher said,"Before you(achieve)your dream,you must learn to manage your time well."
答案区
演练-:1.C2B3.C4B5B6.A7B8.B9B10B
1.ate;went 2.cooked;came 3.visited;left 4.will call;flies 5.had;seen 6.cross 7.waited;arrived
8.kept;returned 9.entering 10.won't start;arrives
1.went 2.watched 3.came 4.hadn't finished 5.go 6.had;realized 7.does 8.will always finish
9.achieve
答案解析说明
演练一:
1.主从句均为过去动作,用一般过去时,选C。
2.主句将来时,从句一般现在时(主将从现),选B。
3.主句“听过多次”从过去持续到现在(现在完成时),从句“上周唱歌”为过去时,选C。
4.从句遵循“主将从现”,用一般现在时goes,选B。
5.主从句均为过去动作,用一般过去时,选B。
6.主句“从未读过”从过去持续到现在,用现在完成时,选A。
7.主句将来时,从句一般现在时(主将从现),选B。
8.介词before后接动名词,选B。
9.原句逻辑错误(先打篮球后写作业),正确应为“先写作业再打篮球”,但选项中唯一过去式为
B,需结合语境调整句子顺序。
10.主句将来时,从句一般现在时(主将从现),选B。
演练二:
l.过去动作先后发生,用一般过去时ate/went。
2.过去动作,用cooked/came。
3.过去动作,用visited/left。
4.将来计划,主句will call,从句fies(主将从现)。
5.“2020年搬去哈尔滨”为过去动作,主句“从未见过”用过去完成时had seen。
6.祈使句,从句用一般现在时cross。
7.“刚刚”为过去时间,用waited/arrived。
8.“昨天还书”为过去动作,主句“保留两周”用过去完成时had kept。
9.介词before后接动名词entering。
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初三下册教科版(五四制)
【语法专练】
Unit5核心突破
l0.将来时否定won’t start,从句用gives(主将从现)。
演练三:
1.过去动作,用went。
2.过去动作,用watched。
3.过去动作,用came。
4.“妈妈回来前未完成作业”,用过去完成时hadn't finished。
5.祈使句,从句用一般现在时g0。
6.“昨天意识到”为过去动作,主句用过去完成时had realized。
7.一般现在时表习惯,用does。
8.将来时,用will always finish。
9.从句用一般现在时achieve(主将从现)。
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