用法索引
1.表示过去某个时刻或某一阶段正在进行的动作。构成： be（was，were） 现在分词，常用的时间状语：at 10：30 last night ，this time yesterday evening
Eg1.What were you doing at three oclock yesterday afternoon？
2.用于when，while 引导的时间状语从句中。用过去进行时表示较长的动作。过去进行时可用于主句，也可用于从句。
Eg1.I was doing my homework when someone knocked at the door.
Eg2.We were walking along the river when suddenly it rained.
Eg3.While he was waiting at the bus stop，the traffic accident happened.（ While 后的分句必须用进行时）
Eg4.While I was reading ，my sister was sleeping.（表示对比，都用进行时）
3.用于表示过去将来的动作。常用在间接引语中。
Eg1.She was leaving early the next morning.
Eg2.I asked him whether he was coming back for dinner.
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