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預(yù)約高中1對1精品課程(面授/在線)，滿足學(xué)員個性化學(xué)習(xí)需求 馬上報名↓
要點——時間狀語從句，由以下連詞引導(dǎo)：
when while as after before as soon as since till /until by the time 在時間狀語從句中，要注意時態(tài)一致。一般情況下主句是將來時的時候，從句要用一般現(xiàn)在時。
1.when當(dāng)……的時候
Mozart started writing music when he was four years old.
(當(dāng))莫扎特的時候，開始寫音樂作品。
2.while當(dāng)……時
He visited a lot of places while he was traveling.
他在旅途中參觀了許多地方。
3.as在。。。的同時;一邊……一邊……
He smiled as he stood up.
他一邊站起來一邊笑著。
4.after在……之后
He left the classroom after he had finished his homework the other day.
前幾天做完功課之后回的家。
5.before 在……之前
Mr. Brown had worked in a bank for a year before he came here.
布朗先生來這之前已經(jīng)在一家銀行里工作一年了。
6.as soon as 一……就……
We began to work as soon as we got there.
我們一到那就開始工作。
I will write to you as soon as I get home.
我一到家就給你寫信。
7.since 自。。。以來 到現(xiàn)在
表示自過去的一個起點時間到目前(說話時間)為止的一段持續(xù)時間。主句一般用現(xiàn)在完成時，從句用一般過去時。
Mr GREen has taught in that school since he came to China three years ago.
自格林先生來中國以來，他就在這所學(xué)校教書。
(還可以用作介詞，本句從句還可以用短語：since three years ago(自三年前以來)表示。)
8 till /until
都可以作連詞，連接時間狀語，也可以作介詞，與其它詞構(gòu)成介詞短語，在句中作狀語。
They walked till /until it was dark.
他們一直走到天黑。
Xiao Ming didn’t leave home till / until his father came back.
小明直到他爸爸回來才離開家。
9. by the time 到。。。為止 (所在句子的主句應(yīng)用完成時)
By the time he gets there , his father has already gone.
他到家的時候，他爸爸已經(jīng)走了。
By the time I got to school, the class had already began.
我到校時，已經(jīng)開始上課了。
難點——as when while的辨析
as when while都表示主、從句動作同時發(fā)生，三者差異如下：
表示“一邊。。。一邊"的意思
as 強(qiáng)調(diào)兩個動作同時進(jìn)行，并表示對比時
用于發(fā)生時間較段時
when 1、還可以表示從句動詞的動作在主幾句動詞的動作"之前 "或"之后"發(fā)生。
2、when=and then; at that moment (正在那個時候)
while
1、用于時間較長時
2、 強(qiáng)調(diào)兩個動作同時進(jìn)行，并表示對比時
有時這三個連詞可以互換，有時不可以。
It was raining hard when (as) I got there.
我到那里時，正在下大雨。 ( 動作同時發(fā)生，when可換為as, 但不能換為while，因為get是點動詞.)
When I had read the article, he called me.
我看完這篇文章之后，她給我打了電話。( 從句動作發(fā)生在主句之前，注意時態(tài)表達(dá)，只能用when )
When I got to the cinema, the film had begun.
(當(dāng))我到了電影院時，電影已經(jīng)開演了。(從句的動作發(fā)生在主句之后，只能用when,并要注意時態(tài))
He was about to leave, when the telephone rang.
他正要離開，忽然電話響了。( 此時不能放在句首。主句動詞一般表達(dá) “正在” “即將”.
while, as不能代替 ) 考點
She thought I was talking about her daughter, while, in fact, I was talking about my daughter.
他以為我在談她女兒，然而，實際上在談?wù)撐遗畠骸?表轉(zhuǎn)折，對比，when, as都不能代替它) 考點
lWhile the alien was buying a souvenir, the girl called the police.
外星人買紀(jì)念品時，那女孩給警察打了電話。(表示主句，從句的動作同時發(fā)生，while后引導(dǎo)的狀語從句的動詞必須是延續(xù)動詞不能是點動詞，因為它表示較長時間)考點
Mother was worried BECause little Alice was ill, especially as (when/ while) father was away.
媽媽擔(dān)心，因為小愛麗絲病了，特別是他父親不在家的時候。(此時as ,when, while可通用)
知識擴(kuò)展
1. It is since從。。。以來多長時間了(因為since +從句或名詞，表示一段時間)
It is five years since we met last time.從我們上次見面已經(jīng)五年了。
2. It is +before…(。。。才)
It was a long time before I went to sleep again.
過了很長時間我才睡著。
It was an hour before(=until) the police arrived.
過了一個小時，警察才來。
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