背对背信用证-平禹四矿
现在完成时态由 have 加动词的过去分词构成,主语是第三人称单数时,要将
have 改
为 has。
例句:I have seen the film
already.我已经看过那部电影了(现在我知道电影的内容了。)
Have you seen
my bag? 你看到我的手提包了吗? (你知道它在哪里? )
She has been a
dancer for ten years. 她已当了十年的舞蹈演员了。
We’ve
planted thousands of trees in the past few years.
过去几年我们种了成千上
万棵树。
时态详解及专项练习专题
对于初接触现在
完成时的人来说,往往会产生一种茫然,因为它似乎与一般过去时相似。
那就是,这两种时态描述的动作
都始于过去。其实不然,现在完成时主要表示,发生在过去
的动作延续到现在刚刚完成、或许还要延续;
侧重于这个动作对现在带来的结果、产生的影
响、积累的总和等等。而一般过去时则只不过是表示动作发
生在过去的什么时候。弄清了这
一区别,就很容易理解现在完成时了。它主要适用于下面的几种情况:
1)表示截止现在业已完成的动作 By now, I have collected all
the data that I
need .到现在为止,我已收集到了我所需的全部资料。
She has read 150 pages today .她今天已看了150页。
We haven't met for many years .我们已多年没见了。
They have developed a new product
.他们研制成功了一种新产品。
2)表示发生在过去而对现在产生影响、带来结果的动作
Have you had your dinner? 你吃晚饭了吗?
She
has been to the United States. 她已去美国了。
You
have grown much taller.你长高了许多。
3)表示过去发生的动作持续到现在,并可能还要延续
It has been five
years since he joined the army .他参军五年了。
They
have learned English for eight years .他们已学了八年的英语了。
So far we've only discussed
the first five chapters.至今我们还只讨论了前五章。
几点注意1)一个句子应该用什么时态只能取决于它需要表达的意思,以及它所处的语言
环境。例如:
He speaks English .(一般现在时,说明动作发生的经常性。)
He spoke English when he was in New Zealand
.(一般过去时,说明动作发生的时间。)
He is speaking
English.(现在进行时,说明动作正在进行。)
He has spoken
English for three years since he came to the
USA.(现在完成时,
这里说明动作的总和。)
He has been
speaking English since he came to the USA.
(现在完成进行时,强
调动作的连续性。)
2)在含有时间状语从句或条件状语从句的主
从复合句中,如果主句的谓语动词是一般
将来时,那么从句的谓语动词就只能用一般现在时来表示将来时
;如果主句的谓语动词是
过去将来时,那么从句的谓语动词就只能用一般过去时来表示过去将来时。
例如:I will not play tennis if it rains
tomorrow.
I would not play tennis if it
rained the next day.
3)
有些动词表示无法持续的动作,它们一般不宜用于进行时态中。这类动词常见的有:
be ,
believe , consist , find , forget , hate , have ,
hope , hear , know , li
ke , love , notice ,
prefer , remember , see , seem , smell , suggest ,
taste ,
understand , want , wish , sit down ,
stand up 等等。
Be动词若是用于进行时态,可表示暂时、短暂的情况或表现。例如:
Tom is being a good boy today .汤姆今天很乖。
He is being childish .他这样做是耍孩子气。
You are not
being modest .你这样说不太谦虚。
4)关于现在完成时的时间状语问题
A. 凡是完成时态都表示,不知道也不管动作发生的具体时间,
所以在使用现在完成
时的句子里,不可以带有表示具体过去时间的状语,如:yesterday ,
last week ( month ,
year ,
etc. ) , two weeks ago , in 1999等;但常和有些副词连用,如:
just , bef
ore , already , often , never , ever
, not…yet , always等等。
B. 在以when提问的特殊疑问中不能用现在
完成时。另外,ago不能用于现在完成时的
句子里,因为它表示从现在算起的以前某个时间,属于表示
具体过去时间的状语。但是可以
用before
来表示以前的意义,因为它只表示以前,而不知什么时候的以前。
C. 如果是不表示连续性的动
词用于现在完成时的句子,不可以和以for表示的一段时
间的状语连用。在这种情况下,应该用
;since…
He has joined the army for five
years. (错误)
It has been five years since he
joined the army.(正确)
一、单项选择
1、Both
his parents look sad .Maybe they
_________what's happen
ed to him .A. knew
B. have known C. must know D.will know
2、He has _____ been to Shanghai , has he
?A. already B.never
C.ever D. still
3、Have you met Mr Li ______?A.just B. ago
C.beforeD. a moment ago
4、The famous writer
_____ one new book in the past two year
A. is
writing B.was writing C.wrote D.has
written
5、-Our country _____ a lot so far
.-Yes . I hope it will be even ______ .
A. has
changed well B. changed good
C. has
changed better D. changed better
6、Zhao
Lan ______already ______in this school for two
years .
A. was studying B. will studyC.
has studied D. are studying
7、We ______
Xiao Li since she was a little girl .
A. know B. had known C. have known D.
Knew
8、Harry Potter is a
very nice film .I_______ it twice .
A. will
see B. have seen C. saw D.see
9、-These farmers have been to the United
States .
-Really ? When _____ there ?
A. will they go B. did they go
C.
do they go D. have they gone
10、-______ you ___ your homework yet ?
-Yes . I _____ it a moment ago .
A. Did
; do finished B. Have done finished
C. Have done have finished D. will do
finish
11、 His father ______ the Party
since 1978 .
A. joined B. has joined C.
was in D. has been in
12、-Do you know him
well ?
- Sure .We _________ friends since
ten years ago .
A. were B. have been C.
have become D. have made
13、-How long have
you _ here ? -About two months .A been
B.goneC.comeD
arrived14、Hurry up! The play
__________ for ten minutes .
A. has
begun B. had begun C. has been onD. began
15、It __ ten years since he left the army .A.
is B. has C.will D. was
16、 Miss Green
isn't in the office . she______ to the
library .
A.has gone B. went C.will go
D. has been
17、My parents ______ Shandong
for ten years .
A. have
been in B. have been to
C. have gone
to D. have been
18、The students have
cleaned the classroom, ?
A. so they
B. don't they C. have they D. haven't they
19、has Mr White been a member of Greener
China since he to China?
A. How soon,
comes B. How often, got
C. How
long, came D. How far, arrived
20、 His uncle for more than 9 years.
A. has come here B. has started to work
C. has lived there D. has left the
university
二、句型转换
3、The old man
_________ last year. He for a year. (die)
(动词填空)
4、This factory opened twenty years
ago.(同义句转换)
This factory
________ for twenty years.
5、Miss Gao left
an hour ago. (同义句转换)
Miss Gao ________
_______ ________ ________ an hour ago.
6、Her
mother has been a Party member for three years
.(同义句)
Her mother _______ the Party three
years ________ .
7、The Green Family moved
to France two years ago. (同义句转换)
_______
two years ________ the Green family moved to Fra
nce.
8、The bus has arrived here. It arrived
ten minutes ago. (把两个句子合并成一
个句子)
当然的英文-嘲笑英语
含气量-朔气传金柝读音
生灵涂炭-腹围是什么意思
我的理想演讲稿-sonofbitch
独岛-海啸的意思
充耳不闻-protestant
莽的拼音-上墙
foreign怎么读-hideous
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