1、首先我们先来看一个题目：There _____ a boy and two girls in the classroom.问题：在这个题目中，应该填入is还是are?
3、该怎么使用there be结构？N1 be 前面可以加上情态动词例如：There may be some troubles in this thing.
5、N3 否定式直接在be后面加no/not例句：、There i衡痕贤伎s no money for you to spend.There is 荏鱿胫协not the girl who you want to find.
