现在完成时的结构
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2021年01月21日 12:37
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月亮之上歌词-
现在完成时的结构
现在完成时由“
have/has+
过去分词”构成,主要有两个含义:
①
表示动作发生在过去,但与现在的情况有联系,有时无时间状语,有时和一些
表
示不确定的过去时间状语连用,如:
many times
,
just
,
yet
,
ever
,
never
,
already
,
before
,
so far, by now
等连用。
②
表示从过去某一时间开始一直延续到现在并还可能继续延续下去的动作,
用于
延续性动词,且句中常带有表示一段时间的时间状语,如:
since +
时间点
/
从
句
,
for two mon ths, so far
等。
二、
1
)现在完成时和一般过去时都能表示过去发生过的动作,
但现在完成时表
示过去动作对现在的影响,并且表示这一动作已完成或还可能继续下去;
2
)而
一般过去时与现在的情况没有联系,
仅表示过去的动作,且这一动作到说话时已
终止。因此现在完成时不能与表示明确的过去时间如
:
in 1949 , yesterday
,
last
week
等的状语连用,并且用
when
或
where
对这些时间和地点状语提问时,一般
只
用一般过去时。
三、
在“
it is first/second
...time that...
。” 或在“
it/this/that is the
+
最高级
+
名词
+that...
。
”结构中,
that
从句中的动词常用现在完成时;在 “
it +
be ...+si nee
从句”这一结构中,
be
可用一般现在时或现在完成时,
since
从句一般
用过去时。
have/has/had +been +
动词的现在进行时
比较过去时与现在完成时
1
)
过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作;现在
_____
成时为过去发生的,强调过去的事情对现在的影响,强调的是影响。
2
)
过去时常与具体的时间状语连用,而现在完成时通常与模糊的时间状语连用,
或无时间状语。一般过去时的时间状语
:
yesterday, last week
,
,ago, in1980, just now,
具体的时间状语
共同的时间状语
:
this morning, tonight, this April, now, onee
,
before, already, reeently
,
lately
现在完成时的时间状语
for, sin ee, so far, ever, n ever, just, yet, till / un til, up to now, in past years, always,
不确定的时间状语
3
)
现在完成时可表示持续到现在的动作或状态,
动词一般是延续性的,如
live,
teach, lear n, work, study, know.
过去时常用的非持续性动词有
come, go, leave, start, die, fini sh, become, get
married
等。
举例:
I saw this film yesterday.
(强调看的动作发生过了。)
I have see n this film.
(强调对现在的影响,电影的内容已经知道了。)
Why did you get up so early?
(强调起床的动作已发生过了。)
Who has n't han ded in his paper?
(强调有卷子,可能为不公平竞争。)
She has returned from Paris.
她已从巴黎回来了。
She retur ned yesterday.
她是昨天回来了。
He has bee n in the League for three years.
(
在团内的状态可延续
)
He has bee n a League member for three years.
(
是团员的状态可持续
)
He joined the League three years ago.
(
三年前入团,
joined
为短暂行为。
)
I have fini shed my homework now.
---Will somebody go and get Dr. White?
---He's already been sent for.
句子中如有过去时的时间副词(如
yesterday, last, week, in 1960
)时,不
能使用
现在完成时,要用过去时。
(错)
Tom has written a letter to his parents last night.
(对)
Tom wrote a letter to his parents last night.
用于现在完成时的句型
1
)
It is the first / second time,. that,
结构中的从句部分,用现在完成
时。
It is the first time that I have visited the city.
It was the third time that the boy had been late.
2
)
T
his is the, that,
结构,
that
从句要用现在完成时
.
This is the best film that
「
ve
(
ever
)
see n.
这是我看过的最好的电影。
This is the first time
(
that
)
I've heard him si ng.
典型例题
这是我第一次听他唱歌。
⑴
---Do you know our tow n at all?
---No, this is the first time I
__ here.
A. was B. have bee n C. came D. am coming
答案
B. This is the first time
后面所加从句应为现在完成时,故选
B
。
(
2
)
---Have you _ bee n to our tow n before?
---No, it's the first time I ___
h
ere.
A. eve n, come B. eve n, have come C. ever, come D. ever, have come
答案
D. ever
意为曾经或无论何时,反意词为
never
,此两词常用于完成时。
This is
the largest fish I have ever seen. It is / was the first time
+that-clause
的句型中,从句要用完成时。
注意:非延续性动词的否定形式可以与表示延续时间的状语连用。
的状态是可以持续的。
即动作不发生