半助动词有哪些

Question

如题所述

Answer 1

半助动词(semi-auxiliary)是兼有助动词和主动词双重词性的动词形式，它有三种类型：
be- 型、have- 型和seem- 型， 它们的词项列表如下：

be- 型：be able to / be about to / be apt to / be bound to / be certain to / be going to / be liable to / be obliged to / be supposed to / be sure to / be (un)likely to / be to / be willing to , etc

have- 型：have to / have got to / had better , etc

seem- 型：seem to / appear to / come to / fail to / get to / happen to / tend to / turn out to ,etc

（摘自章振邦主编：《新编高级英语语法》）
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Answer 2

这一些结构之所以叫做“半助动词”,是因为它们在语法上既有主动词的特征又有助动词的特征.