英語從句的語法學習方法
從句是英語語法的重要組成部分，也是我們學好英語的過關知識，以下是小編爲大家整理的關於從句的語法詳解，希望能幫到你。
賓語從句三類的用法詳解
賓語從句可以分爲三類
(1).動詞的賓語從句
1.1 大多數位於動詞後面
Eg：I hope you can join us in the game.
1.2 有些是“動詞+副詞”後
Find out / point out / figure out / turn out/ figure out
Eg： Can you figure out what the poet really means in this poem?
1.3 有些動詞短語後面
Make sure / make up one’s mind / keep in mind
Eg; we should keep in mind that sports can be a great boost to our health.
(2) it 作形式賓語代替賓語從句
第一類動詞; find/ feel/ think/ consider/ make / believe/ guess/ suppose /assume等後面有賓語不足語時，需要用it 作形式賓語而將that引導的真正的賓語從句後置。
Eg： I think it necessary that we do some sporting.
第二類動詞 帶賓語從句時需要在從句前面加it。
這類詞：hate / like/ dislike/ appreciate/ depend on/ see to /
Eg: I hate it when they talk without considering other’s feeling.
但是如果賓語從句是WH-類引導的，其後面有to be 短語作賓語補足語，不可以用it 代替。
We all consider what you said to be unbelievable. (right)
We all consider it to be unbelievable what you said .(wrong)
(3) 形容詞後的賓語從句
Adj: sure / certain/ glad/ pleased/ happy / afraid / sorry 等等。
Eg; I am not sure whether you will come or not.
引導狀語從句的連詞講解
從屬連詞
從屬連詞是引導狀語從句，賓語從句及其他從句的連詞。
1.引導狀語從句的從屬連詞有：
1)when, while, before, after, as soon as, until, since等，引導時間狀語從句。
2)because, as, since等引導原因狀語從句。
3)if, as long as等引導條件狀語從句。
4)though, although引導讓步狀語從句。
5)so…that…, such…that…等引導結果狀語從句。
6)so that引導目的狀語從句。
7)as?as?;than等引導比較狀語從句。
2.常用從屬連詞的辨析
1)when, as, while
when, as, while都表示“當…的時候”，但when引導的時間狀語從句的動作和主句的動作可以是同時發生，也可以先後發生，when既可指時間點，也可指一段時間，所以既可引導一短暫動作動詞，也可引導持續性動作的動詞。
用as作從屬連詞引導時間狀語時強調主句和從句的動作並行發生，不指先後，尤指短動作或事件同時發生。如：As I looked, someone came near.(正當我看的時候，有個人走上前來。)as還可說咱兩種正發展或變化的情況，意爲“隨着”。如：As spring warms the earth, all flowers begin to bloom.(隨着春回大地，百花開始綻放。)表示主從句動作同時，as意爲“一邊…一邊…”。如：He hurried home, looking behind as he went.(他匆匆忙忙跑回家，一邊走一邊回頭望。)
分詞或分詞短語作狀語用法
㈠ 分詞或分詞短語作狀語時，可以表示
時間、原因、條件、讓步(可轉換成相應的狀語從句)
① Put into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
Put into use in April 2000 == When it was put into use in April 2000(時間狀語)
② Blamed for the breakdown of the school computer network, Alice was in low spirits.
Blamed for the breakdown of the school computer network
== Because she was blamed for the breakdown of the school computer network(原因狀語)
③ Given time, he'll make a fist-class tennis player.(條件狀語)
Given time == If he is given time
④ Left at home, John didn't feel afraid at all.
Left at home == Although he was left (讓步狀語)
表示方式，伴隨狀況或結果(可以轉換成並列句或非限制性定語從句)
① We often provide our children with toys, footballs or basketballs, thinking that all children like these things.
thinking that all children like these things.== and think that all children like these things.(伴隨狀語)
② He earns a living driving a truck.
driving a truck == by driving a truck. (方式狀語)高考對分詞用作方式狀語考得
③ He fired, killing one of the passers-by.
He fired and killed one of the passers-by. (結果狀語)
④ He died, leaving his wife with five children.
He died and left his wife with five children. (結果狀語)
⑤ It rained and rained, vehicles bogged and bridges washed out.
It rained and rained, and vehicles were bogged and bridges were washed out. (結果狀語)
㈡ 有時爲了強調，分詞前會加when, while, if, unless, once, though, even if, as if 等連詞一起作狀語
When comparing different cultures, we often pay attention only to the differences.
Though tired, he still continued reading.
Once published， this book will be popular with the students.
㈢ 分詞(短語) 與主語的關係
主語一致：分詞短語的動作由主句主語發出。看以下錯誤
Waiting for the bus, a brick fell on my head.
Hearing the news, tears came into his eyes.
Finding her car stolen, a policeman was asked to help.
When using the computer, the password must be remembered.
有自己主語的分詞結構— 獨立分詞結構。分詞有自己意義上的主語，分詞的動作不由主句主語發出。
The town seen from the hill，we can see it more clearly
.=If the town is seen from the hill，we can see it more clearly. 如果從山上看這座城市，我們能看得更清楚。
Everything taken into consideration，the party was a success. 將所有的事情考慮在內，晚會算是成功的。
while只指一段時間，從句中的謂語動詞不能用終止性動詞，強調某一段時間內主從句動作同時發生，常對同類的動作進行對比。如：While we were waiting for a bus, it was raining hearily.(我們在等車時，天正下着大雨。)
2)till和until
till和until都表示“直到…爲止”。主句用延續性動詞，主句和從句都用肯定式：意爲“直到…才”。主句用終止性動詞，從句用肯定式，主句用否定式。until較till正式，until引導的時間從句可以放在句首。
例如：
She won't go away till you promise to help her.
直到你允諾要幫助她，她才走開。
Until you told me, I had heard of nothing what happened.
直到你告訴我，我才知道發生了什麼事。
3)since
since引導的時間狀語從句常用一般過去時，其主句一般使用現在完成時。
例如：
Jim has been in the factory for two years since he left school.
從吉姆畢業起，他在這家工廠工作兩年了。
