副词在半助动词的哪答:半助动词可大体分为三种类型:一种是以be 为中心成分,如 be about to, be bound to, be going to, be sure to, be certain to, be(un)likely to, be to;另一种是以 have为中心成分,如have to, have got to,had better;第三种是以seem/happen/appear/tend等为中心成分,如 seem ...
is和has的用法区别答:助动词 最常用的助动词有:be, have, do, shall, will, should, would 半助动词 功能介绍 在功能上介乎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, be obliged to, be supposed to, be willing...