我看完這篇文章之后，他給我打了電話。( 從句動(dòng)作發(fā)生在主句之前，注意時(shí)態(tài)表達(dá)，只能用when )

　　When I got to the cinema, the film had begun.

　　(當(dāng))我到了電影院時(shí)，電影已經(jīng)開演了。(從句的動(dòng)作發(fā)生在主句之后，只能用when,并要注意時(shí)態(tài))

　　He was about to leave, when the telephone rang.

　　他正要離開，忽然電話響了。( 此時(shí)不能放在句首。主句動(dòng)詞一般表達(dá) "正在""即將".

　　while, as不能代替

　　She thought I was talking about her daughter, while, in fact, I was talking about my daughter.

　　他以為我在談她女兒，然而，實(shí)際上在談?wù)撐遗畠骸?表轉(zhuǎn)折，對(duì)比，when, as都不能代替它)

　　While the alien was buying a souvenir, the girl called the police.

　　外星人買紀(jì)念品時(shí)，那女孩給警察打了電話。(表示主句，從句的動(dòng)作同時(shí)發(fā)生，while后引導(dǎo)的狀語(yǔ)從句的動(dòng)詞必須是延續(xù)動(dòng)詞不能是點(diǎn)動(dòng)詞，因?yàn)樗�表示較長(zhǎng)時(shí)間)

　　Mother was worried because little Alice was ill, especially as (when/ while) father was away.

　　媽媽擔(dān)心，因?yàn)樾�愛麗絲病了，特別是他父親不在家的時(shí)候。(此時(shí)as ,when, while可通用)

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