新概念3册23课,I happened to be walking in my garden,请问为什么用to be w

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/04 14:52:21

新概念3册23课,I happened to be walking in my garden,请问为什么用to be walking?

happen to do sth.为固定用法,表示碰巧在做某事.
而doing表示当时在正在发生.
所以这句话可以理解为,碰巧我正走进花园.
再问：也就是不定式的进行时？
再答：不定式的大体方向是表示在谓语动词后发生，即将来，但是在非谓语作宾语的时候，有些动词固定要接不定式；而当不定式作原因状语的时候就不是表示将来的意思了。而不定式的进行式表示与谓语同时发生的意思。这里应该就是这种表达。 happen 和 walk 这两个动作同时发生。

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