初中英語狀語從句知識點
狀語從句指句子用作狀語時，起副詞作用的句子。接下來小編為你整理了，一起來看看吧。
：時間狀語
要點: 時間狀語從句，由以下連詞引導：
when while as after before as soon as since till /until by the time 在時間狀語從句中，要注意時態一致。一般情況下主句是將來時的時候，從句要用一般現在時。
1.when當...的時候
Mozart started writing music when he was four years old.
***當***莫扎特的時候，開始寫音樂作品。
2.while當...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...之後
He left the classroom after he had finished his homework the other day.
前幾天做完作業之後回的家。
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在一家銀行裡工作一年了。
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***為止的一段持續時間。主句一般用現在完成時，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，連線時間狀語，也可以作介詞，與其它詞構成介詞短語，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，他爸爸已經走了。
By the time I got to school, the class had already began.
我到校時，已經開始上課了。
難點――as when while的辨析
as when while都表示主、從句動作同時發生，三者差異如下：
表示“一邊...一邊"的意思
as 強調兩個動作同時進行，並表示對比時
用於發生時間較段時
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"之後"發生。
2、when=and then; at that moment ***正在那個時候***
while 1、用於時間較長時
2、 強調兩個動作同時進行，並表示對比時
有時這三個連詞可以互換，有時不可以。
lIt was raining hard when ***as*** I got there.
我到那裡時，正在下大雨。 *** 動作同時發生，when可換為as, 但不能換為while，因為get是點動詞.***
lWhen I had read the article, he called me.
我看完這篇文章之後，她給我打了電話。*** 從句動作發生在主句之前，注意時態表達，只能用when ***
lWhen I got to the cinema, the film had begun.
***當***我到了電影院時，電影已經開演了。***從句的動作發生在主句之後，只能用when,並要注意時態***
lHe 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 “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，實際上在談論我女兒。***錶轉折，對比，when, as都不能代替它*** 考點
While the alien was buying a souvenir, the girl called the police.
外星人買紀念品時，那女孩給警察打了電話。***表示主句，從句的動作同時發生，while後引導的狀語從句的動詞必須是延續動詞不能是點動詞，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***
知識擴充套件
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。
：地點狀語
要點: 由連詞where和複合關係詞wherever ***=no matter where ***引導.
知識擴充套件
1.Where there is a will , there is a way.
有志者事竟成。***諺語***
1.It will be mixed school where not all the children are disabled.
他將是一所混合式學校，那裡的兒童並不都是殘疾。***在限定性定語從句中對限先行詞起限定作用。***
2.Wherever you go , I go too.
無論你到什麼地方，我都去。***wherever=no matter where***無論何處，多用於句首。
3.Wherever there is smoke , there is fire.
無風不起浪。***諺語***
4. While she was wondering where to go , she met a policeman.
疑問副詞where後跟不定式,構成不定式短語.
：原因狀語
要點：由連詞because，since，as引導，也可由for，now that 等詞引導
1.I didn't go to school yesterday because I was ill.
我昨天沒去上學，因為我生病了。
2. Since everybody is here，let's begin our meeting.
既然大家都來了，讓我們開始開會吧。
3. As you are in poor health，you should not stay up late.
既然你身體不好，你就不該熬夜。
4.I asked her to stay to tea，for I had something to tell her.
我請她留下來喝茶，因為我有事要告訴她。
難點――because，since，as，for辨析
在語氣上，because 最重，表示的是直接理由，回答why 時只能用它。其次是since，as，一般不表示原因，而是表明理由，進一步說明。***譯為：由於，既然***。for 被認為是複合句的並列連詞***常用於推斷***，表示理由。