since表原因的用法总结

2021-09-23

since表原因的用法总结

since和for表示原因时有什么区别及用法?

since 和for表示原因时的区别用法。

关于since表原因,

since表既然的意思,用于句首表示既然的意思,有种勉强的语义, 例如 Since he asks,you tell‘ll him why. 懂了没

英语问题 since在表示 因为 时的用法

since的用法:译作“自从…以来”
1)接时间点:如
I
have
stayed
in
that
country
since
1995.
要求:谓v.用现在完成时,而且须是延续性动词。
2)接一段时间
+
ago:如
They
have
lived
in
that
house
since
two
years
ago.
要求:谓v.用现在完成时,而且须是延续性动词。
3)接时间状语从句:如
I
have
loved
her
since
I
met
her
last
time.
/
Lily
has
stayed
at
home
since
she
left
school.
要求:主句的谓v.用现在完成时,而且须是延续性动词;从句的谓v.用一般过去时,而且须是终止性动词。
4)用于句型“It’s
/
It
has
been
+
一段时间
+
since
+
时间状语从句”中,译作“自从…以来,
已经…(时间)了”。如
It’s
/
has
been
three
months
since
he
moved
to
this
city.
要求:主句的谓v.用一般现在时或现在完成时;从句的谓v.用一般过去时,而且须是终止性动词。
5)用于句型“一段时间
+
has
passed
since
+
时间状语从句”中,译作“自从…以来,

(时间)已经过去了”。如上个例句还可写成:Three
months
has
passed
since
he
moved
to
this
city.
要求:主句的谓v.用现在完成时,而且动词必须是has
passed;从句的谓v.用一般过去时,而且须是终止性动词。
6)注:当since用于否定句时,主句的谓v.可以是终止性动词。如
He
hasn’t
seen
the
film
since
last
month.
7)相关词组:“从那时起”:ever
since、since
then、from
then
on.注:ever
since作为一个词组,放句尾可单独使用。如I
have
given
up
smoking
ever
since.
另外,还可在since后接句子。since前加ever,只是加重语气而已。如
I
have
given
up
smoking
ever
since
I
caught
a
bad
cough.
8)
since还可引导原因状语从句,译作“由于;因为”,相当于because。如
Since
he
was
lazy,
he
didn’t
finish
his
homework.

since的用法。

since的用法主要有两点:一是表示“自从……以来”,二是表示“既然”之意。但如果只了解词的含义,而不了解其用法,在使用时就会造成错误。例如:I have not heard from him since I lived in Shanghai.
不少人会望文生义,将该句译为:“自从我住在上海以来,就再也没有收到他的信了。”而实际上这个句子的译文并非如此,那么正确的含义是什么呢?
下面谈谈since作连词引导时间状语从句的用法。
一、若since引导的状语从句的谓语动词是终止性的过去时,则从句表示的时间是“从动作开始的那一时刻起”。如:
He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力。
We have been missing them since they left here自从他们离开这里,我们就一直很想念他们。
这是最常见的一种用法,此处不再多述。
二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时,则从句表示的时间是“从那持续动作或状态结束时算起”。如:
I haven’t heard any noise since I slept. Sleep 为持续性动词,sleep的动作结束时,即“醒来”时,这句应译为“我醒后还未听到任何声音”。
John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约,他不当教师已经三年了。
本文开始出现的那个句子就可以译为“自从我离开上海,就再也没有收到他的信。”这种译法常被人们误用,我们不妨再多举几个例子看看:
How long is it since you lived in Shanghai?你离开(没住在)上海多久了?
It is half a month since he was a League member.他退团(不当团员)半个月了。
It’s been quite some time since I was last in London我离开伦敦已很长时间了。
比较:He has written to me frequently since I was ill.自从我病愈以来,他屡次给我写信。(从句谓语为状态动词)
He has written to me frequently since I fell ill.自从我生病以来,他就屡次给我写信。(从句谓语为终止性动词)
三、若since引导的状语从句的谓语为持续性动词的现在完成时,则表示动作和状态延续到现在(说话时刻),其表示的时间的起点应从动作发生之时算起。如:
I haven’t heard from him since he has lived there。
这里has lived表示动作的持续性,时间的起点应从:“开始居住”时算起。因此此句可理解为“自从他(开始)住在那儿起,我就一直没收到他的来信”。
Since we have owned a car, we have gone camping every year。自从我们自己有了汽车,我们每年都去野营。
试比较:1. Since I’ve been at this school, we have had three headmasters.自从我到这所学校,我们已换了三个校长了。
Since I was at this school, they have had three headmasters.自从我离开这所学校,他们已换了三个校长了。
2.He has never been to see me since I have been ill. 自从我生病以来,他从未来看过我。
He has never been to see me since I was ill. 自从我病愈以来,他从未来看过我。
由此可见,since引导的从句持续动词的一般过去时和现在完成时所表示的意思恰好相反。换言之,前者以肯定的语法形式反映着否定的逻辑内容,而后者的形式与内容是一致的。
至于It is +一段时间+since…的句型与It has been +一段时间+since…意思相同。前者是规范说法,后者是口语说法。
应注意的是,在这种结构中,since引导的从句绝对不能用否定式的谓语动词来表示否定意义,下面两句都错了:
It is a long time since he didn’t study English.
It’s two months since you didn’t come to see me.
正确的说法为:
It’s a long time since he studied English 他好久没学英语了。
You haven’t come to see me for two months. 你有两个月没来看我了。

for后面能不能接句子 for表原因的时候接句子,是起连词作用?

没错.for只有表原因时才是连词,但用法有别于because等,是作推理时用的理由.
地上湿了,因为昨晚下过雨了.
The ground is wet,for it rained last night.
但是,洒水车也可以使地上湿的.所以,下雨只是一种推理.

for表原因时,后面能跟名词和句子?请分别举例说明,

可以的~
for表原因,后面跟名词(名词词组)
The match is cancelled for the heavy rain.
for表原因,后面跟句子.(for前面一定要加逗号,这里的for=because,只是因果语气稍弱)
I love him, for he loves me so deeply.

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