1、九類不帶to的動詞不定式（一） 作使役動詞let, have, make的賓語補足語的動詞不定式不帶to。例如：She let her child play in the park. 她讓她的孩子在公園里玩耍。I had him arrange for a car. 我叫他給我安排了一輛車。She made her children wash their hands before eating. 她要她的孩子們在吃東西前洗手。注意：當使役動詞make用于被動語態時，則該動詞必須加上to。例如：He was made to leave school by his father's dea

2、th. 由于他爸爸的死，他被迫離開了學校。（二）作感官動詞see, watch, hear, feel, notice, observe等的賓語補足語的動詞不定式不帶to。例如：I saw him cross the street. 我看見他橫穿馬路。I felt the ship roll. 我們感覺船在搖晃。注意：當此類動詞用于被動語態時（watch一般不用于被動語態），則充當主語補足語的動詞不定式要帶動詞不定式符號to。例如：He was seen to enter the office. 有人看見他進了辦公室。（三） why (not) + 不帶to的動詞不定式。例如：Why not

3、come and see me tomorrow? 明天來找我怎么樣？（四） had better + 不帶to的動詞不定式。例如：You'd better go now. 你最好現在走。（五）rather than位于句首時，其后用不帶to的不定式，但rather than在句中時，其后的動詞不定式可以帶to，也可以不帶toRather 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.

4、（六）在find后作賓語補定語的動詞不定式有時可以省to，但如動詞為be，那么一般不省to，要省一起省略"to be"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后的動詞不定式一般要帶to，但如果其前有作謂語的實義動詞do，則不定式不帶toThe soldier has no ch

5、oice but to obey. He did not have any choice but to obey.She did nothing but clean the dishes.（八）兩個或兩個以上的動詞不定式并列在一起時，第一個不定式帶to，后面的不定式一般省去toHer job is to take care of the children and wash clothes.（九）在動詞help后作賓語補足語的動詞不定式可以帶to，也可以不帶，在英國英語中，多用不帶to的不定式，但在英國英語中，help+賓語+不定式結構中，用不帶to的不定式表示主語直接參與不定式的表示的動作，用帶to的不定式表示主語沒有直接參與不定式的表示的動作。 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.但在被動語態中，help后的不定式要帶to She wa