there are或there is

1.there are 后面接复数名词。
There are many needy families in our village.
我们村子有很多贫困家庭。
there is 后面接单数名词或不可数名词。
There is a TV show about AIDS on right now.
电视正在播放一个关于爱滋病的节目。
As long as we are united, there is no difficulty we cannot overcome.
只要大伙儿拧成一股绳, 没有克服不了的困难。

2.以there开关的句子，若主语在两个或两个以上，谓语动词通常与临近的主语一致

There is a book and three pens on the desk.
There are some books and paper for you.

不明白你补充的问题到底想问什么，说清楚吧

there be 句型中，be 的单复数形式由其后的名词决定，如果有两个或两个以上的名词，则按就近原则决定。
如：
There is only a desk in the room .
There is only a desk and two chairs in the room .
There are two chairs and a desk in the room .
同样的，即使是and并列关系复数也有特例如果是a knife and fork作主语,谓语动词用单数.(因为一副刀叉表示的是一个整体.)
a chair and desk

there are 后面接复数类的。
there is 后面接单数或不可数。

there are 后面接复数类的。
there is 后面接单数或不可数。

看后面是复数还是单数啊