一、概念
狀語從句修飾主句中的動詞，形容詞，副詞等，在複合句中作狀語。引導狀語從句的關聯詞是從屬連詞。狀語從句用陳述句語序，一般位於複合句的句首或句末。當從句在句首時，從句後常用逗號和主句相隔。狀語從句根據其在句中的不同作用分別表示時間，地點，原因，目的，結果，比較，讓步，行為方式等。
二、相關知識點精講
1、地點狀語從句
地點狀語從句通常由where, wherever 引導。例如：
Where I live there are plenty of trees. 我住的地方樹很多。
Wherever I am I will be thinking of you. 不管我在哪裡我都會想到你。
2、方式狀語從句
方式狀語從句通常由as, as if, as though引導。
1)as從句帶有比喻的含義，意思是"正如…"，"就像"，多用於正式文體。例如：
Always do to the others as you would be done by. 你希望人家怎樣待你，你就要怎樣待人。
2)as if, as though引出的狀語從句謂語多用虛擬語氣，表示與事實相反，有時也用陳述語氣，表示所說情況是事實或實現的可能性較大。漢譯常作"彷彿……似的"，"好像……似的"。例如：
They completely ignore these facts as if (as though) they never existed. 他們完全忽略了這些事實，就彷彿它不存在似的。(與事實相反，謂語用虛擬語氣。)
He looks as if (as though) he had been hit by lighting. 他那樣子就像被雷擊了似的。(與事實相反，謂語用虛擬語氣。)
It looks as if the weather may pick up very soon. 看來天氣很快就會好起來。(實現的可能性較大，謂語用陳述語氣。)
說明：as if / as though也可以引導一個分詞短語、不定式短語或無動詞短語。例如：
He stared at me as if seeing me for first time. 他目不轉睛地看著我，就像第一次看見我似的。
He cleared his throat as if to say something. 他清了清嗓子，像要說什麼似的。
The waves dashed on the rocks as if in anger. 波濤衝擊著岩石，好像很憤怒
3.原因狀語從句
比較because, since, as和for：
1)because語勢最強，用來說明人所不知的原因，回答why提出的問題。當原因是顯而易見的或已為人們所知，就用as或 since。例如：
I didn't go, because I was afraid. 我不去是因為我怕。
Since /As the weather is so bad, we have to delay our journey. 天氣那麼糟，旅行推遲了。
2)由because引導的從句如果放在句末，且前面有逗號，則可以用for來代替。但如果不是說明直接原因，而是多種情況加以推斷，就只能用for。例如：
He is absent today, because / for he is ill. 他今天缺席，因為他病了。
He must be ill, for he is absent today. 他一定病了，所以今天缺席。
4.目的狀語從句
表示目的狀語的從句可以由that, so that, in order that, for fear that, in case等詞引導。例如：
You must speak louder so that /in order that you can be heard by all. 你必須大點聲，別人就能聽見了。
He wrote the name down for fear that(lest) he should forget it. 他寫下了這個名字以免以後忘記。
Better take more clothes in case the weather is cold. 最好多穿點衣服，以防天發冷。
5.結果狀語從句
結果狀語從句常由so…that 或 such…that引導。so…that與such…that之間可以轉換。例如：
The boy is so young that he can't go to school. 這男孩年齡太小，不能上學。
He is such a young boy that he can't go to schoo.
6. 條件狀語從句
連接詞主要有 if, unless, as/so long as, on condition that 等。if 引導的條件句有真實條件句和非真實條件句兩種。非真實條件句已在虛擬語氣中闡述。
unless = if not. 例如：
Let's go out for a walk unless you are too tired. 如果不太累，我們去散散步。
If you are not too tied, let's go out for a walk.
7. 讓步狀語從句
1)though, although引導的讓步狀語從句，後面的從句不能有but，但是 though 和yet可連用。例如：
Although it's raining, they are still working in the field. 雖然在下雨，但他們仍在地裡幹活。
He is very old, but he still works very hard. 雖然他很老了，但仍然努力地工作。
2) as, though 引導的讓步從句表語或狀語提前(形容詞、副詞、分詞、實義動詞提前)。例如：
Child as /though he was, he knew what was the right thing to do. 雖然是個小孩，該做什麼不做什麼，他全知道。
3) ever if, even though 即使。例如：
We'll make a trip even though the weather is bad. 即使天氣不好，我們也要去遠足。
4) whether…or… 不管……都。例如：
Whether you believe it or not, it is true. 信不信由你，這確實是真的。
5) "no matter +疑問詞" 或"疑問詞+後綴ever" 。例如：
No matter what happened, he would not mind. =Whatever happened, he would not mind. 不管發生什麼，他不在意。
替換：no matter what = whatever
no matter who = whoever
no matter when = whenever
no matter where = wherever
no matter which = whichever
no matter how = however
注意：no matter 不能引導主語從句和賓語從句。
8. 比較while, when, as
1)as, when 引導短暫性動作的動詞。例如：
Just as / Just when / When I stopped my car, a man came up to me. 我一剎車，有一個人向我走來。
2)當從句的動作發生於主句動作之前，只能用when 引導這個從句，不可用as 或 while。例如：
When you have finished your work, you may have a rest. 趕完活後，你可以休息一下。
3)從句表示"隨時間推移"連詞能用as，不用when 或while。例如：
As the day went on, the weather got worse. 日子一天天過去，天氣越變越壞。
9.比較until和till
此兩個連詞意義相同。肯定形式表示的意思是"做某事直至某時"，動詞必須是延續性的。否定形式表達的意思是"直至某時才做某事"。動詞為延續性或非延續性都可以。正確使用這兩個連詞的關鍵之一就在於判斷句中的動詞該用肯定式還是否定式。肯定句：I slept until midnight. 我一直睡到半夜時醒了。
Wait till I call you. 等著我叫你。(在肯定句中可用before代替。例如 Let's get in the wheat before the sun sets.)
否定句：She didn't arrive until 6 o'clock. 她直到6點才到。
Don't get off the bus until it has stopped. 公共汽車停穩後再下車。
I didn't manage to do it until you had explained how. 直到你教我後，我才會做。
區別： until可用於句首，而till通常不用於句首。例如：
Until you told me, I had heard nothing of what happened. 直到你告訴我以前，出了什麼事我一點也不知道。
注意：否定句可用另外兩種句式表示。
1)Not until…在句首，主句用倒裝。例如：
Not until the early years of the 19th century did man know what heat is. 直到19 世紀初，人類才知道熱為何物。
2)It is not until… that… 。例如：
It was not until I began to work that I realized how much time I had wasted.
10.表示"一…就…"的結構
hardly/scarcely…when/before, no sooner…than 和as soon as都可以表示"一…就…"的意思。例如：
I had hardly / scarcely got home when it began to rain. 剛回家，就下起雨來了。
I had no sooner got home than it began to rain.
As soon as I got home, it began to rain.
注意：如果hardly, scarcely 或no sooner置於句首，句子必須用倒裝結構。例如：
Hardly / Scarcely had I got home when it began to rain.
No sooner had I got home than it began to rain.
三、狀語從句考點分析
1、狀語從句雖然有完整的主謂結構，卻是不能獨立的從句。
2、狀語從句它由從屬連詞引導成為整個句子一個不可缺少的部分。
3、考查的熱點有條件、時間、地點、讓步等狀語從句的連接詞詞義辨析。
4、動詞的時態呼應、狀語從句的省略等。
5、題乾結構呈交叉和綜合特徵，選項設計多從定語從句和名詞性從句的角度進行思維干擾。
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