用There is和There are造句是有关教室物品方位的用下列单词table blackboard teacher pencup paper students chalk

There is a blackboard in the classroom.
There are some students have some pens.

首先，paper/chalk 这两个词是不可数名词(uncountable noun), 用 there is，且不加冠词。
其余的都是可数名词(countable noun)，单数时用there is, 复数时用there are。
然后，观察所给词中，在所有的可数名词中，只有students给的是复数形式，所有应该用there are,其他可数名词都给了单数形式，应该用there is,外加冠词“a”。

There is a blackboard in the front of the class.
There is a tables near the window.
There is a teacher in front of the blackboard .
There is a chalk behind the box.
There is a pen and cups near the blackboard .
There is a cup onthedesk.
There are some students play near the classroom.
There is some paper under the book.