So long as you work hard, you will surely achieve good results in examinations.

　　I shall return next Thursday unless something unexpected happens.

　　I will go provided that you go with me.

　　Please give this letter to John in case he comes.

　　3) 讓步狀語從句

　　讓步狀語從句主要由以下連詞引導：though, although, even if, even though, whatever, however, whoever, wherever, no matter how/ what/ where/ when等。以下介紹幾種較特殊的讓步狀語從句。

　　(1) while引導的讓步狀語從句多放在句首，while相當于although，表示“盡管”，“雖然”。

　　While I admit I did it, I didn’t intend to.

　　While I understand what you say, I can’t agree with you.

　　(2) 短語“even now/then/so”相當于“though it is/was true”，表示“盡管如此”，“盡管這樣”。

　　The fire was out, but even so, the smell of smoke was strong.

　　I’ve tried my best, but even now/then she is not satisfied.

　　(3) as引導的讓步狀語從句要倒裝。

　　Child as he was, he could speak four languages.

　　Hard as she tried, she failed to get the job.

　　4) 比較狀語從句

　　比較狀語從句主要由以下連詞引導：(not) as … as, (not) the same as, (not) such … as, not so … as, than, the + 比較級…, the +比較級…等。

　　We have had a lot more rainfall this year than we had last year.

　　She can speak English as fluently as her teacher (can).