there be句型是倒装句的一种,主语是a dog,所以谓语动词用is,there是 副词,状语,under the table作地点状语They are talking about eating .主语they,谓语动词are talking,状语about eating;或者是主语they谓语动词are talking about,宾语eating;哪种分析正确呀？老师，麻烦你了。。。语they谓语动词are talking about,宾语eating 这个正确，talk about 一个词组作谓语