常用的關聯詞有:when(當……時候),whenever(在任何時候),while(當……時候),as(正當……時),every/each time(每次),before(在……以前),after(在……以後),since(自……以來),till/until(直到……),as soon as(一……就),the moment(一……就),the minute(一……就),hardly…when(剛……就……),no sooner…than(剛……就……),等。如:
I’ll tell you about it when we meet.我們見麵時,我會告訴你有關情況的。
As he was carrying out the experiment,he found something abnormal.
正當他在做試驗時,他發現情況有些異常。
Please eat it while it is hot.請趁熱吃。
It has been more than two years since we parted last time.
自我們上次分手至今已有兩年多了。
注意:
1.在含有時間狀語從句或條件狀語從句的主從複合句中,如果主句的謂語動詞是一般將來時,那麽從句的謂語動詞就隻能用一般現在時來表示將來時;如果主句的謂語動詞是過去將來時,那麽從句的謂語動詞就隻能用一般過去時來表示過去將來時。如:
Tom will tell him the truth when he comes back.
他回來時,湯姆會告訴他事實真相的。
Tom would tell him the truth when he came back.
他回來時,湯姆會告訴他事實真相的。
2.when,whenever,while和as這幾個連詞在表達意思方麵比較接近,但是也有一定的區別:
whenever是when的強調形式;while和as的後麵都可以用來表示“正值什麽時候”或是“一邊……一邊……”的意思,因此後麵都可以接“進行時”;另外,如果將when改寫在主句之前,可表示主句謂語動作發生的突然性。如:
While she was watching TV,she was cracking seeds.
她一邊看電視一邊嗑瓜子。
As he was doing his packing,some of his friends came to say good-bye to him.