英语:助动词的问题he must(can't may等) have been asleep,就有两个助动词,must ,
英语:助动词的问题he must(can't may等) have been asleep,就有两个助动词,must ,
助动词:can ,may .must的基本用法!
can、will、would、shall、may、must等助动词具体怎么用,还有do和have,
may,can,should,needn't,must,had better not等后面跟动词原形的助动词提问时都是把
情态助动词用法?can,shall,need,must,will,may,have to的用法
"do"与can、will、would、shall、may、must助动词用法一样吗 有什么区别
有must/could/can/may/maight have been done吗
He must have been asleep at that time,(wasn't) he?为什么是用 wasn
选词填空(can't have been\must be\must have been\can't be \may ha
he can't have been Danish.he must have been Swedish.
He can't have been.He must have been.不是说单三用has吗?
must是不是助动词?