to+动词原形 1、want to +动词原形 2、how to +动词原形 3、need to +动词原形 4、would like to+动词原形 5、be happy to +动词原形 6、be glad+动词原形 7、use......to +动词原形 8、It's time to +动词原形 情态动词+动词原形 1.can/can't+动词原形 2.should/shouldn't+动词原形 3.must/mustn’t+动词原形 4.will/won’t+动词原形 5.do/does/did +动词原形 6.shallwe +动词原形 7.let+宾格+动词原形 8.help+动词原形 9.may+动词原形 10.祈使句动词原形开头 11.have to+动词原形 -ing 结构 1. enjoy doing sth. 2. finish doing sth. 3. give up doing sth. 4. imagine doing sth. 5. suggest doing sth. 6. practice doing sth. 7. mind doing sth. 8. put off doing sth. 9. permit doing sth. 10. discuss doing sth.