1.情态动词后面加原型：can,may,should.......
2.助动词后面也是：do,did,does
3.to后面是要加动词手神原型的，不过一些固定搭配也有谨念to后面加动词ing形式的，比如说，make a contribution to doing; look forward to doing..........不能光看to哦祥薯困，O(∩_∩)O~希望对你有帮助哈！
动词不定式后面和can, could, will, would, may, might, 等含漏洞情态动词后面加动词原形。一般情况下，搜锋在动词let, make, see, watch, hear, have, listen, 等后面带间接宾语时，谈枯其后面的动词为不带to的动词原形。如：I let him go."go"是不带to的动词原形
一般to后加动原，还有情态动搜首笑词像can could may would等，后面世含都接动词原形芹纳；句型Cuold you please+动原。介词和动词后一般+动词ing
1.情态动词后面加原型：can,may,should.......
2.助动词后面也是：do,did,does
3.be going to , will ,let , make ,see ,hear ,watch ,feel ,notice 等后加动词御首原形。
4.why not , would you please 等后加动词原世羡形镇返数。
must .must not ,should not