sb's job is to do sth 是在什么时态时用的

sb's job is to do sth 是在什么时态时用的 sb's job is to do sth 是对的还是sb's job is sth是对的? make sb do sth 在第三人称时用不用变换DO的时态? 在it is adj of/for sb to do sth中,fair用什么介词 英语语法结构it's+adj+for sb+to do sth...像这样的句型,for sb 是作什么状语? it's too adj for sb to do sth 同义句是sb is adj enough to do （太. 像it`s time to do sth help sb to do sth这些在英语里算什么 是词组 还是短语 亲回答 英语翻译用sb./sth.is believed to do sth. 是sth is important to sb还是 it is important for sb to do sth? made sb do sth 与sb is make to do sth 有什么不同? 用下列句型造句tell sb. to do sth.ask sb. to do sth.want sb. to do s what sb to do sth中的sth.是该句子的什么成分?为什么?