The teacher found nobody but Jack____(sit) in the room

问题描述:

The teacher found nobody but Jack____(sit) in the room

sitting为什么?译文:老师发现教室里只有杰克一个人坐在那里。解释:the teacher是主语,found是谓语,nobody but Jack是宾语,____(sit) in the room在句中充当宾补成分。此空要填的是非谓语,且Jack(非谓语的逻辑主语)与sit是主动关系,所以用现在分词形式。