1.The missing boy was last seen playing near the East Lake.

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1.The missing boy was last seen playing near the East Lake.
2.The little boy was watched to leave the store where he stole several valuable watches.
这两句话对吗?如果将第1句的 playing 改为 to play ；将第2句的 to leave 改为 leaving .为什么?如果对,区别是什么?

不对,1是一种状态.表示被看到时正在玩.看到之前在玩之后状态持续.所以要用ING 形式.TO 不具有这层意思.2表示那男孩STOLE只是一时的动作不具状态连贯性.这两句子正好可反正.

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