stood at the entrance to the station ,(observing) passengers

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：2024/05/16 01:52:23

stood at the entrance to the station ,(observing) passengers to go in and out.
为什么用obesrving 不用to observe ,不是表目的么

答：用observing表示伴随情况,两个动作同时发生或几乎是同时发生的.
用不定式表示目的,放主句后,不用逗号,放主句前才需要一个逗号.再说句意没有前一种好.要观察,还有更好的地方.就好象将句子：He sat there thinking.改为He sat there to think.一样,句意不好.

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