1、在作主语时，如to read english aloud is very important，或者it's very important to read English aloud.大声朗读英语是很重要的
2、作宾语时，如i want to play football, i find it easy to study English，作表语时，如My plan is to study English well
3、在作定语时，如i must find a man to talk, 我必须找一个人聊天，或 i have nothing to do，我没有可以做的事情
4、作状语如，we did a lot of work just to improve our abilities，或he got up early that day, only to be told that it's saturday
5、作补语时，如he asked me to do homework他叫我写作业，He was asked to finish the work他被叫去完成这个工作
6、不定式的语态有，主动如，it is great for me to play football every day，被动it's great for me to be invited at your party
