狀語從句用法總結(jié)

　　下面是小編整理的一些關(guān)于狀語從句用法的總結(jié)， 希望能幫助大家更好地認識狀語從句，提高英語水平。

　　一、由when, while, as引導(dǎo)的時間狀語從句

　　1. when引導(dǎo)的時間狀語從句中的謂語動詞可以是延續(xù)性動詞，也可以是瞬時動詞。when有時表示“就在那時”。如：

　　When she came in, I was doing some housework. (瞬時動詞)

　　When I lived with the Smiths, we used to discuss international issues together. (延續(xù)性的動詞)

　　We were about to leave when he came in. (when表示“就在那時”)

　　2. while引導(dǎo)的時間狀語從句中的謂語動詞必須是延續(xù)性的，并強調(diào)主句和從句謂語動詞所表示的動作同時發(fā)生(或者相對應(yīng))。如：

　　While my wife was reading the newspaper, I was watching TV.

　　(was reading是延續(xù)性的動詞，was reading和was watching同時發(fā)生)

　　3. as 引導(dǎo)的時間狀語從句中的謂語動詞表示延續(xù)性的動作，一般用于主句和從句動作同時

　　發(fā)生，有時也可以強調(diào)動作一先一后發(fā)生。如：

　　We always sing as we walk.

　　As we were playing out, it began to snow.

　　二、由till或until引導(dǎo)的時間狀語從句

　　till和until一般情況下兩者可以互換，但是在強調(diào)句型中多用until。需要注意的是：如果主句中的謂語動詞是瞬時動詞時，必須用否定形式;如果主句中的謂語動詞是延續(xù)性動詞時，用肯定或否定形式都可以，但表達的意思不同。如：

　　Don’t open it till your birthday.

　　It was not until the meeting was over that he began to teach me English.

　　Continue in this direction until you see a sign.

　　I didn’t work until he came back.

　　三、由since引導(dǎo)的時間狀語從句

　　1. 若since引導(dǎo)的狀語從句的謂語動詞是終止性的過去時，則從句表示的時間是“從動作開始的那一時刻起”。如：

　　He has studied very hard since he came to our school.

　　We have been missing them since they left here.

　　2. 若since引導(dǎo)的狀語從句的謂語動詞是持續(xù)性動詞或表示狀態(tài)的動詞的過去式時，則從

　　句表示的時間是“從那持續(xù)動作或狀態(tài)結(jié)束時算起”。如：

　　How long is it since you lived in Shanghai?

　　John is now with his parents in New York. It is already three years since he was a teacher.

　　四、由as soon as, immediately等引導(dǎo)的時間狀語從句

　　as soon as, immediately, directly, instantly, the moment, the instant, the minute等這些詞語均表示“一……就……”。如：

　　I want to see her the moment she arrives.

　　I came immediately I heard the news.

　　注意：hardly (scarcely, rarely) … when / before; no sooner … than也表示“剛……就……”，但是其主句使用過去完成時，從句用一般過去時，而且，當(dāng)hardly, scarcely, rarely和no sooner位于句首時，主句應(yīng)用倒裝語序。如：

　　Hardly had we begun our walk when it began to rain.

　　I had no sooner left than she called.

　　五、由each time, every time引導(dǎo)的時間狀語從句。如：

　　Each time she moved her head she let out a moan.

　　六、由by the time引導(dǎo)的時間狀語從句

　　如果從句的謂語動詞用一般過去式，主句的謂語動詞用過去完成時;如果主句的謂動詞用一般現(xiàn)在式，主句的謂語動詞用將來完成式。如：

　　By the time they get here, we’ll have finished the work.

　　By the time you come here tomorrow, I will have finished this work.

　　七、由the first time引導(dǎo)的時間狀語從句

　　the first time常引導(dǎo)時間狀語從句，其重點不是講第一次做什么，而是說明另一動作或情況;也可以作表語，強調(diào)到說話為止某一情況或動作的次數(shù)。如：

　　I knew we would be good friends the first time I met her.

　　比較：for the first time表示有生以來或一段時間內(nèi)第一次做某事，在句中一般單獨作狀語。如：

　　The two girl students talked for the first time at the beginning of the term.