三、 在復(fù)合句中，如果主要?jiǎng)幼骱捅尘皠?dòng)作都是延續(xù)的或同時(shí)發(fā)生的，那么主從句的動(dòng)詞都可用過去進(jìn)行時(shí)。

While he was waiting for the bus, he was reading a newspaper.他邊等車邊看報(bào)。(兩個(gè)動(dòng)作都是延續(xù)的)He was cleaning his car while I was cooking.

他擦車時(shí)我在做飯。(兩個(gè)動(dòng)作同時(shí)進(jìn)行)

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