The chair is too dirty to sit on.为什么要加on呢?

来源：学生作业帮编辑：百度作业网作业帮分类：英语作业时间：2024/05/20 23:31:07

The chair is too dirty to sit on.为什么要加on呢?
不及物动词在什么时候需要加介词

及物和不及物的区别就是在于动词后跟宾语,及物可以直接加宾语,如：read a book,但不及物就不能直接加宾语,需要加介词来承接,如：arrive in beijing.
其实你上面这句是被动语态,如果是主动语态则是：to sit on the chair is too dirty.这个你应该知道sit 后面要有"on"
也就是说不及物动词不管是在主动语态还是变成被动语态都要保持有介词.
因为这两种语态是可以相互转换的,在你从被动语态转换过来的时候不能把词给丢了,如过没有这个on,转换过来就是to sit the chair is too dirty.这样是不通的,可以理解了吗?

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