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BE Doing whEn知识点

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

正在做…这时…,此外还有be about to do something when …be on the point of doing something when …将要做某事,这时 …

这是when引导时间状语从句的问题.主句和从句所用时态必须根据语义来确定.例: I was having dinner at a restaurant when Tony Steele came in. When she came in, I stopped eating.

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?

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.

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.

其实是省略句,等同于"when they are playing basketball.",不过把主语和系动词省略了

The students were having a class when suddenly a bird flew in

【be+doing+while+be+doing】:I was watching TV while it was raining cats and dogs outsides.外面在下倾盆大雨时,我正在看电视.I was doing my homework,when he came in.他进来时,我正在看电视.【英语牛人团】倾情奉献,看完满意请记得及时采纳,

be doing sth…when 正要做某事,恰好 when 后面的那件事情发生.I was watching the football match when he came in.当他走进来的时候我正在看足球赛.

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