被动语态的助动词?情态动词、助动词的被动语态我书上写seem toappear tohappen tohave to +be done used to be used toseem ,appear ,happen ,used ,be used 也是助动词?
问题描述：
被动语态的助动词?
情态动词、助动词的被动语态
我书上写
seem to
appear to
happen to
have to +be done
used to
be used to
seem ,appear ,happen ,used ,be used 也是助动词?
答
只有及物动词才有被动语态,你所说的seem ,appear ,happen ,used ,be used 不是助动词．被动语态的助动词只有be
被动语态由“助动词be＋及物动词的过去分词”构成