1、过去进行时.1. 过去进行时表在过去某一时刻或某一段时间内正在进行或发生的动作.是由“was/were+现在分词”构成.was 用于第一、三人称单数,were 用于其他人称.与过去进行时连用的过去时间状语有:at this/that time、yesterday morning、at that moment、at 10 oclock last night 等.2、 判断句子是否用过去进行时.根据时间状语判断:at eight/ten oclock last night、at this/that time 1yesterday、at ten yesterday evening、from 7 to
2、 10 yesterday evening 等.根据 when 或 while 引导的状语从句判断 ,如:I was reading the 2newspaper when my father got home.根据上下文的意思判断,如:Last night,I was watching TV. 3Suddenly(突然) the light was out.3、 when 与 while 在过去进行时中的句型结构.(1) when 的用法:when 从句 (一般过去时)+ 主句(过去进行时) 1动作:fell into the sea、fishing.例句:When one of them
3、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) 2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.(2) while 的用法:while 从句(过去进行时)+主句(一般现在时) 1动作:watching、began to rain.例句:While I was watching
4、 the football game,it began to rain.意义:从句动作正在进行时,又发生主句动作.While 从句(过去进行时)+主句(过去进行时) 2动作:washing、cooking.例句:While Dad was washing his car ,Mum was cooking.意义:从句动作正在进行的同时,主句动作也在进行中.4、 特别提示.When 引导的从句既可表某一点时间,后接瞬间性动词(when 句型) ;又可表某一段时间,后接延续性动词.也就是说:当指一段时间 1时,when 可用 while 代替 ;但当指一点时间时, when 不能用 while代替.如:When we arrived in shanghai,it was just eight oclock.(when 指一点时间)When/while we were watching TV,he came in.(when 与 while 指一段时间)!注意:while ()we arrived in shanghai