6.條件狀語從句

　　表示條件的狀語從句可以由if(如果)，unless(除非)，in case(萬一)，so /as long as(只要)，as/ so far as(就……而言)，on condition that(條件是……)，suppose(假設(shè))，supposing(假設(shè))(僅用在問句中)等詞或詞組引導(dǎo)。一般情況下當(dāng)主句是將來時的時候，從句要用一般現(xiàn)在時。

　　As/So long as we don't lose heart, we'll find a way to overcome the difficulty. 只要我們不灰心，我們就能找到克服困難的方法。

　　Send us a message in case you have any difficulty. 萬一有什么困難，請給我們一個信。

　　If you leave at 6 o'clock tomorrow morning, you'd better get to bed now. 如果你明早6點鐘走，你最好現(xiàn)在就上床。

　　We'll let you use the room on condition that you keep it clean and tidy. 只要你能保持整潔，我們可以讓你使用這個房間。

　　As/So far as I know, he is an expert on DNA. 據(jù)我所知，他是一個DNA專家。

　　He'll accept the job unless the salary is too low/ if the salary is not too low. 他會接受這項工作的，除非薪水太少/如果薪水不太少的話。

　　Suppose/Supposing we can't get enough food, what shall we do? 假設(shè)我們弄不到足夠的食物，那我們怎么辦?

　　7.方式狀語從句

　　方式狀語從句常由as(與……一樣)， as if(仿佛)， as though(仿佛)等詞引導(dǎo)：

　　Do in Rome as the Romans do.入鄉(xiāng)隨俗。Leave things as they are.讓一切順其自然。

　　She stood at the door as if (=as though) she were waiting for someone.

　　她站在門口，仿佛在等人似的。(由as if或 as though引導(dǎo)的從句中可用虛擬語氣)

　　8.比較狀語從句

　　比較狀語從句常由than(比)， as(與……一樣)等詞引導(dǎo)：

　　It rains more often in Shanghai than in Beijing.上海下的雨比北京的多。

　　Our country is as big as the whole of Europe.我們的國家同整個歐洲一樣大。

　　The result was not as/so good as I had expected.結(jié)果不如我預(yù)料的那么好。

　　The busier he is， the happier he feels.(常見句型)他越忙越開心。

　　9.讓步狀語從句

　　讓步狀語從句由although(盡管)，though(盡管)，however(無論怎樣)，whatever(無論什么)，whoever(無論誰)，whomever(無論誰)，whichever(無論哪個)，whenever(無論何時)，wherever(無論哪里)，whether(是否)，no matter (who, what, where, when, etc)(無論……)，even if(即使)，even though(即使)等詞引導(dǎo)。如：

　　We won't be discouraged even if (=even though) we fail ten times. 我們就是失敗十次也不泄氣。

　　It was an exciting game, though / although no goals were scored. 那是一場精彩的球賽，盡管一個球都沒進(jìn)。(though， although不能與 but連用)

　　Whether you believe it or not, it's true. 不管你信不信，這是真的。

　　However (=No matter how) expensive it may be, I'll take it. 無論它有多貴，我也要買下它。

　　Don't let them in, whoever(=no matter who) they are.不管他們是誰，別讓他們進(jìn)來。

　　No matter what I say or how I say it, he always thinks I'm wrong. 無論我說什么或怎么說，他總認(rèn)為是我錯。

　　連詞as也可以引導(dǎo)讓步狀語從句，但從句中要用特殊語序。如：

　　Young as he is, he knows a lot=Though he is young 或Young though he is, he… 他雖然年輕，但懂得很多。