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九类不带to的动词不定式
（一）作使役动词let, have, make的宾语补足语的动词不定式不带to。例如：
She let her child play in the park. 她让她的孩子在公园里玩耍。 I had him arrange for a car. 我叫他给我安排了一辆车。
She made her children wash their hands before eating. 她要她的孩子们在吃东西前洗手。
注意：当使役动词make用于被动语态时，则该动词必须加上to。例如：
He was made to leave school by his father's death. 由于他爸爸的死，他被迫离开了学校。
（二）作感官动词see, watch, hear, feel, notice, observe等的宾语补足语的动词不定式不带to。例如：
I saw him cross the street. 我看见他横穿马路。 I felt the ship roll. 我们感觉船在摇晃。
注意：当此类动词用于被动语态时（watch一般不用于被动语态），则充当主语补足语的动词不定式要带动词不定式符号to。例如： He was seen to enter the office. 有人看见他进了办公室。
（三） why (not) + 不带to的动词不定式。例如：
Why not come and see me tomorrow? 明天来找我怎么样？
（四） had better + 不带to的动词不定式。例如： You'd better go now. 你最好现在走。
（五）rather than位于句首时，其后用不带to的不定式，但rather than在句中时，其后的动词不定式可以带to，也可以不带to Rather than ride on a crowded bus,he always prefers to ride a bicycle. He prefers to rent a car rather than(to) have one of his own.
（六）在find后作宾语补定语的动词不定式有时可以省to，但如动词为be，那么一般不省to，要省一起省略\
We found the farm crops(to) do well. I find the Chinese people to be happy and cheerful. I found this to be true in all the cities.
（七）在but(=except),besides,than后的动词不定式一般要带to，但如果其前有作谓语的实义动词do，则不定式不带to
The soldier has no choice but to obey. He did not have any choice but to obey. She did nothing but clean the dishes.
（八）两个或两个以上的动词不定式并列在一起时，第一个不定式带to，后面的不定式一般省去to
Her job is to take care of the children and wash clothes.
（九）在动词help后作宾语补足语的动词不定式可以带to，也可以不带，在英国英语中，多用不带to的不定式，但在英国英语中，help+宾语+不定式结构中，用不带to的不定式表示主语直接参与不定式的表示的动作，用带to的不定式表示主语没有直接参与不定式的表示的动作。
He helped me repair the bicycle. He helped me to repair the bicycle.
This kind of soap helps us to wash the clothes more easily. The book will help you to study English. 但在被动语态中，help后的不定式要带to She was helped to repair her bicycle 在help(to) do sth不定式符号to可省略。 He helped(to) repair the machine.
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