be supposed to 作为半助动词和被动语态用法的差别

be supposed to 作为半助动词和被动语态用法的差别 be supposed to的用法 ought to 和be supposed to 的区别和用法 should 和 be supposed to 的区别与用法? 被动语态的用法被动语态的用法和结构 be supposed to do的用法~ be supposed to的用法问题 be supposed to 的用法 举例说明 英语语法中,动词不定式to do表示被动和动词不定式的被动语态to be done表示被动有什么用法区别 sth need to be done 和sth need doing 两种表被动用法意思上有什么细微的差别 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 + 被动语态的用法