1、半助动词在功能上介于主动词和助动词之间的一类结构,称为半助动词。常见的半助动词有:be about to, be due to, be going to, be likely to, be meant to。2、情态助动词情态助动词后面直接加动词原形,包括will(would), shall(should), can(could), may(might), must, need, dare, ought to, used to, had better。3、基本助动词基本助动词只有三个:be...
阅读更多