过去进行时.docx

文档介绍：过去进行时.
“was/were+现在分词”、三人称单数,:at this/that time、yesterday morning、at that moment、at 10 o’clock last night等.
判断句子是否用过去进行时.
根据时间状语判断:at eight/ten o’clock last night、at this/that time yesterday、at ten yesterday evening、from 7 to 10 yesterday evening等.
根据when或while引导的状语从句判断,如:I was reading the newspaper when my father got home.
根据上下文的意思判断,如:Last night,I was watching TV. Suddenly(突然) the light was out.
when与while在过去进行时中的句型结构.
when的用法:
when从句(一般过去时)+主句(过去进行时)
动作:fell into the sea、fishing.
例句:When one of them fell into the sea,the boys were fishing.
意义:主句动作正在进行过程中,又发生从句动作.
when从句(过去进行时)+主句(一般现在时)
动作:walking、dropped down to.
例句:When I was walking in the park,my wallet dropped down to the
ground.
意义:从句动作正在进行时,又有主句动作发生.
while的用法:
while从句(过去进行时)+主句(一般现在时)
动作:watching、began to rain.
例句:While I was watching the football game,it began to rain.
意义:从句动作正在进行时,又发生主