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BE Doing whEn

答:我们认为这个句型的例句是:I was taking a walk along the lake when it began to rain. 我正沿着湖边散步时,(就在那时候)天就下起雨来了.

1. I was thinking of this when I heard my name called. 我正想着这件事,突然听到有人叫我的名字. 2.She was on the point of going out when the telephone rang. 她正要出去,电话铃响了. 3.I was doing eighty when I overtook you. 我刚才是以每小时八十英里的速度追上你的. 4.What was Linda doing when Davy ran away? 当戴维跑开的时候,琳达正在做什么?

例句:My father was wacthing TV when I came back home last night.be doing:进行时,表正在发生的动作,when:时间副词,后为时间状语从句,时态:由时间副词yesterday可知该句应使用过去式,be动词则用was(单数) 注:除此之外,when 还可跟 had done … when …结构

当…时,正在做某事.此短语一般用在过去进行时中

be+doing +when:用于“正在进行”的动作.可用于“过去进行”,也可用于“现在进行”的表达中.前者 when 后面句子用过去时,后者用一般现在时;be +about to do+when:这个句型表达的是马上要进行的动作.可用于过去时,也可用于现在时句子中.when 后面可用进行时态句子.注意时态与主句吻合;be+On the point of doing +when:这是个“俏皮话”表达方式,与上面的 be+doing +when 同;has just done +when +did:这个句型用于表达主句动作结束.你根据上面的解释写几个句子试试看?

当----时,正在做----

如果写歌词可以这样表达的 或是外国他们有些口语也可以这样.但正式作文或是什么的不可以这样写

I was watching TV when I heard a knock on the door .He was walking on the street when suddenly it began to rain.

固定句型,be doing when,某人在做某事,另一件动作突然发生. when 可用一般时态,可用进行时. as 当.时,因为,随着.一般不用进行时. 用于一般时,表示当时候,有通用的地方. 固定句型不可替换,如 as I grow old, 随着.

when it comes to playing basketball this weekend,jack seems too excited to fall asleep.当说到这周末去打篮球的时候,jack 就兴奋得难以入睡.

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