文档介绍：不定式的时态和语态总结
以下是小编为大家整理的不定式的用法总结，希望能帮助大家更好地认识不定式，提高英语水平。
不定式的时态。动词不定式一般有三种时态形式，即一般式、进行式和完成式。
(1) 一般式(to+动词原形)：步做什么?
it is an honor for me to be asked to speak here. 我很荣幸应邀在这里讲话。
为了避免重复，不定式可省略，但to有时保留，有时不保留。例如：
you will make it if you try (to). 如果你努力，你会成功的。
george says he is going to leave shanghai, but i don’t think he really wants to. george说要离开上海，但是我不认为他真的愿意走。
some of them retired, and others were ready ，还有的准备退。
he always speaks faster than he needs 。
i’d like to do it now, but i haven’t got the time (to). 我倒是想现在干，但没时间。
“would you go there with me?” “i’m glad to.”“你愿意和我一起去吗?”“愿意。”
“did you pass the exam?” “no, i tried (to), but i failed.”“你考试及格了吗?”“没有，我努力了，但没成功。
“do you want to sing them an english song?” “i prefer not to.” “你愿意为他们唱首英文歌吗?”“我不想唱。”
you’d better sing an english song if they ask you (to) ，你最后唱一首英文歌。
后面常省略不定式而保留to的结构，还有：
used to 常常 be going to 打算
mean to 打算 ought to 应该
plan to 计划 want to 要想
两个不定式由and, or, except, but, than 连接时，第二个可省略to，尤其是两个不定式紧密相连时。如：
i intend to call on him and discuss this question again,我打算去拜访他并和他谈谈这个问题。
i’d like to lie down and go to 。
you’re free to talk or laugh 。
i’m anxious to go and ask him about 。
do you want to have lunch now or wait till later? 你想现在吃午饭还是再等会儿?
we had nothing to do exc