情态动词
must shall should can could may might 还有 need dare 做情态动词的时候.
to后面也有时候跟原型啊.
will后面一般也跟原形啊.
助动词在强调句子里面 I did see him.I do like Tommy.
助动词在否定句子里面 I didn't see him.
想起来,其实跟动词原形的还是挺多的.
er.只有do形式的才叫做原形