不定式的用法有哪些?
动词不定式6种用法总结如下：
动词不定式是非谓语动词的一种，形式是“to+动词原形”，可用作：主宾表定状补，唯独不可以作谓语。
一.作主语
It's+adj.+（for sb.)+to do sth.做某事对某人来说是...(形容物）。
eg.It's difficult for me to sing the song.
It's+adj.+(of sb.)+to do sth.做某事某人是...（形容人）。
eg.It's nice of you to invite me to your party.
It takes sb.+ 时间+to do sth.做某事花费某人多长时间。
eg.It takes me half an hour to finish my homework.
二.作宾语
v.+to do。
2.形式宾语 find/think/believe it+adj.+(for sb.)+to do sth.
eg.I found it easy for me to learn English.
3.特殊疑问词+to do。
eg.I don't know where to go.
4.to do/doing。
三.作表语
放在be动词之后作表语，与主语可以互换。
eg.My dream is to be a teacher.
四.作定语
放在名词或代词之后。
eg.I have some work to do.
Would you like something to eat?
五.作状语
1.作目的状语。
eg. I get up early to catch the bus.
2.作原因状语 be+adj.+to do。
eg.I'm glad to meet you.
六.作补语
v.+sb.+to do sth.
