giggled:帮我解释一下

来源:百度文库 编辑:高考问答 时间:2024/05/06 07:46:07
when people have to be at their place of work?
其中的have to be 在语法中怎么解释?
为什么要加be?

be是系动词,后接介词短语作表语, eg. He is at home./ He has to be at home.