2022年中考英语时态复习系列(六)现在完成时
现在完成时表示1)过去发生或已经完成的动作或存在的状态对现在造成的影响或结果.(即它的"完成用法")e.g. i have just cleaned the classroom. 2)过去已经开始,一直持续到现在的动作或状态。注意:此时动作可能还要继续。(即它的"未完成用法")。 e.g. he has lived in beijing for ten years.
其结构是"have/has+过去分词"。过去分词的变化分规则与不规则两种。规则变化与过去式相同,不规则变化需要另记。
它的否定句是在have/has后边加not,变一般疑问句是把have/has提前。e.g. i have ridden a horse. i have not ridden a horse. have you ridden a horse?
它的时间状语通常为already, just, yet, ever, never, before等。另外还可和since+表过去的时间点,for+时间段连用。
做题时常见错误如下:
一、易丢掉have/has
例:he taken (take) the medicine before.
答案:has taken
解析:have/has 为助动词,起构成时态的作用,是不能省略的。我们可以这样记:"现在完成时态中,have/has 不可缺。"
二、have与has易用混
例:i has never heard (hear) of that before.
答案:have heard
解析:现在完成时与一般现在时一样也有单三人称的变化,当单三人称作主语时用 has, 一般人称作主语时用have.
三、延续性动词与短暂性动词易弄错
例:she has left (离开) for 2 hours.
答案:has been away
解析:在肯定句中,与since或for引出的时间状语连用的是延续性动词,不能是短暂性动词,但在否定句中短暂性动词也是可以的。e.g. i haven"t bought clothes for one year. 在此题中leave是短暂性动词,不能与for+时间段连用,须把它改成相应的延续性动词。如stop be over等。此题中leave要改成be away。这两种词的转换是学习现在完成时需要注意的。
专项练习:
一、单选
1 you have _____ a tall young man.
a grown b grown into c grown us d grown up
2 he has ____ the watch for a year.
a buy b bought c have d had
3 has your brother _____ the dog?
a kept in b fed c fed on d kept on
4i _____this book for two weeks, i have to return it now.
a borrowed b have borrowed c kept d have kept
5 have you ever _____to the great wall? it"s very beautiful.
a gone b been c went d go
6 her brother _____the party since 1978.
a joined b has joined c has been in d was in
7 the greens _____many places of interest since they came to china.
a will visit b visited c have visited d visit
8 i"m sorry, i ____ your name.
a had forgotten b forgot c have forgotten d forgotten
9 the bookshop _____ for eight years.
a has been open b has been opened chas opened d has open
10 we have all the paper so we need to buy some.
a used up b made of c filled with d hunted for
11 the flower i ____grown up.
a planted has b planted have c has planted d have planted
答案:1b 2 d 3 b 4d 5 b 6 c 7 c 8 c 9 a 10 a 11 a
二、填空
1 have you ever ______(take) a train?
2 it _________(be ) more than three years since jim ______(leave) here.
3 have you _____(make)friends with your new classmates yet?
4 i _______(have) my lunch and i"m not hungry now.
5 jim has never seen a panda, _____he?
6 we ______(be) good friends since we met at school.
7 we can"t find him anywhere. perhaps he______(go) home.
8 he _____(read) the book before.
9 mr. green _____(teach) us a lot about social studies since september.
10 i _____never____ (meet) her sister before.
答案:1 taken 2 has been, left 3made 4 have had 5 has 6 have been 7 has gone 8 has read 9 has taught 10 have met
四、have been to与 have gone to 易弄混
例:我去过北京。
i have gone to beijing.
答案:i have been to beijing.
解析:"have been to+地点" 是表示曾去过某地,但此刻不在那儿(即在说话的地方)。而"have gone to+地点" 是表示去某地了,此刻在路上或已经到了那个地方(即不在说话的地方)。注意:这两个句式后接副词时,需省to。e.g. he has gone there.
五、 忘记把already变成yet
例:i have already finished my homework.(变一般疑问句)
have you already finished your homework?
答案: have you finished your homework yet?
解析:现在完成时态中,肯定句中有already,变否定句或疑问句时通常要改为yet.
六、在条件、时间状语从句中用一般现在时表示将来
例:i"ll go with you when i finish(finish) my homework.
答案:have finished
解析:在条件、时间状语从句中表示将来完成的动作,用现在完成时。但注意,此时表示这动作将在另一动作之前完成,若两动作同时发生,或几乎同时发生,则一般不用现在完成时。
另外,现在完成时易与一般过去时弄混,前边已经讲过,这里不在重复.
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