see sb.do,see sb.to do和see sb.doing有什么区别

see sb do sth 看见某人做某事(全部过程或全过程持续时间很短)如:I saw him pick an apple.(pick an apple持续时间很短)I saw him go into the room(强调全部过程)see sb do sth 改成被动为:sb be seen ...

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