see sb.do、see sb.to do和see sb.doing有什么区别?
3个回答

see sb doing sth 看见某人做某事(其中一部分过程)如:

When I passed her room,I saw her cleaning her room.(看到一部分)

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 to do sth.

see sb to do sth是不符合英语的表达的.