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

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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
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

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.