Day5: 时间连词

Expression of Time.jpg

when, after, before, until, since, while, once, as, and as soon as are subordinating conjunctions which can be used to connect an action or an event to a point in time.

像when, after, before, until, since, while, once, as, as soon as这样的从属连词通常连接一个动作或者事件表明一个时刻。

action / event	conjunction	time
She was in a bad car accident	when	she was young.
We can't play loud music	after	everyone has gone to bed.
Brush your teeth	before	you go to bed.
I'll wait with you	until	the bus comes.
I've been very busy	since	I started my new job.
No one left the cinema	while	the movie was on.
I'll call you	once	I arrive.
We always have an ice cream	as soon as	we get to the beach.
I bumped into her	as	I came out of the bank

Many of these time conjunctions can be followed by -ing or -ed forms instead of subject + verb.

许多这样的时间连词可以跟随-ing或-ed形式而不是主语+动词

Warning: We don't use will after conjunctions referring to future time.

注意：不可以在连词后面使用will来指明未来时间。

• When people will walk in to the room...

• When people walk into the room, they will feel something special.

• ... as soon as I will get to the office.

• I will call you as soon as I get to the office.

---

when, once, as, as soon as

We can use when, once, as and as soon as to talk about a special point in time when something happened or will happen:

我们可以使用when, once, as, as soon as来说明一个特殊的时刻，当事情发生过了或将要发生。

• when we were in Greece, we went to as many islands as possible.

• They always close their curtains once they get home in the evening.

• As soon as we hear any news, we'll call you

before, after, until

We use before and after to talk about the order of events in the past or future. With before and after, either the main clause or the subordinate clause can come first:

我们可以使用before和after来说明时间在过去或将来时间中的顺序。使用它们，主句或从句可以放在前面。

• She'll pick you up before she comes here.

• After she comes here, she'll pick you up.

Util as a time conjunction means up to a time in the past or future. In the case of until, the main clause usually comes first:

until作为一个时间连词指明了过去或将来时间，主句通常放在前面：

• I am going to wait until the January sales start to buy a new jacket.

• Until he mentioned his neme was Doug, I thought he was called Damien.

while

We use while to show that actions or events happen at the same time in the past, present or future:

while用来指明动作或事件发生在过去、现在或将来的相同时间。

• Can you wait in the car while I run into the shop?

• They were talking while the teacher was explaining the activity.

Warning: We don't use during instead of while. During is a preposition, not a conjunction, and it must be followed by a noun or a pronoun:

注意：在这里我们不使用during, 因为during是一个介词，不是连词，它后面必须跟一个名词或者代词。

since

We use since to refer back to a previous point in time. We use since as a conjunction to introduce a subordinate clause:

since被用来提及先前的时刻，作为连词的时候用来引出一个从句：

• It's so long since I saw them. (since+clause)

• He's been back to the office a few times since he retired. (since+clause)

We also use since as a preposition with a date, a time or a noun phrase:

since作为介词时通常和日期、时间或名词短语搭配：

• It was the band's first live performance since May 1990. (since+date)

• I have been happily married for 26 years since the age of 21. (since+noun phrase)