《大学英语 2》 unit 6使役动词后面要接动词要用 to 吗？使役动词 have, let, make 和感官动词 feel, hear, see, watch 后的不定式常省略 to,但这些动词的被动用法中，to 需要还原。我们等待他完成任务。We wait for him to complete the task. 老师建议他每天听新闻。The teacher advised him to listen to the news everyday. 2．不带 to 的不定式都有哪些？1） 在 had better, would rather, might as well, cannot but 等搭配之后I'd rather not have eggs and bacon for breakfast. They cannot but accept his term. 2） 在“动词+宾语+不定式”结构中，表示“感觉”或“致使”的动词，如 see, feel, smell, hear, watch 等，或是意义的，如 have, make, let I saw him enter the building. John made her tell the truth. 　　注意：这类结构转换为被动态时，后面的不带 to 的不定式须转换为带 to 的不定式。3） 在“Why...”或“Why not...”结构中， 紧接其后的动词不定式总是不带 to。Why argue with him? 干吗跟他吵呢？Why not go shopping with us?《大学英语 2》 unit 7 FAQ1. used to 这个短语的用法有哪些?used to (do sth.)过去常常 (后接动词原形)e.g. I used to go to the cinema a lot, but I never get the time now.be/get used to doing sth. 习惯于…… (后接动名词)e.g. I never was/got used to going to bed so early.be used to do sth. 被动态（被用于……）e.g. The liquid is used to clean the smear.2. spend 这个词如何用? spend 有固定搭配用法,具体为:spend (time/money) (in) doing sth.spend on sth.e.g. He has spent half his life (in) writing this book.Would you spend $200 on a new coat?3. eager avid keen anxious 四个词的区别在哪？意思都含“渴望的”。eager 指“以巨大的热情渴望实现愿望或达到目的的”, 有时也指“由于其他感情影响而表现急不可耐的”, 如:He was eager to see her.他渴望见到她。avid 指“以强烈的(有时是贪婪的)愿望去获取的”, 如:He was avid for gold.他贪图黄金。keen 指“对某人、某物怀有极大兴趣或热情的”, 如:They were keen to win.他们急于取胜。 anxious 指“热切地希望实现愿望,并因顾虑愿望落空而心情不安,感到焦虑的”, 如:l'm anxious to know the final result.我急于想知道最后的结果。