作业帮Be doing sth when..一系列“正在做.忽然做."哪个加动词原形?哪个通常用在过去完成时?为什么
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/27 07:51:54
Be doing sth when..一系列“正在做.忽然做."哪个加动词原形?哪个通常用在过去完成时?为什么
Be doing sth when..be about to do sth when..be on the point of doing sth when..had done sth when
Be doing sth when..be about to do sth when..be on the point of doing sth when..had done sth when
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.
再问： had done sth when...这个不用过去完成时？
再答： 如果语义需要用过去完成时就用，例如： I had nearly reached the town, when the young man suddenly said, very slowly, 'Do you speak English?' （新概念第二册第14课）
例：I was having dinner at a restaurant when Tony Steele came in.
When she came in,I stopped eating.
再问： had done sth when...这个不用过去完成时？
再答： 如果语义需要用过去完成时就用，例如： I had nearly reached the town, when the young man suddenly said, very slowly, 'Do you speak English?' （新概念第二册第14课）
Be doing sth when..一系列“正在做.忽然做."哪个加动词原形?哪个通常用在过去完成时?为什么
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be doing sth.when
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try to do sth.和try doing sth.这两个词组哪个是努力做某事,哪个是尝试做某事?
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