Что куда нужно положить? there is there are a boy in the classroom. children in the classroom. a cup on the table two apples in the bag. a lady in the house. a pencil under the chair. a picture in the room a puppy in the box. an ice cream on the table four balls under the table new words in the text two carrots in the basket

There is a boy in the classroom
There are children in the classroom.
There is a cup on the table.
There are two apples in the bag.
There is a lady in the house.
There is a pencil under the chair.
There is a picture in the room.
There is a puppy in the box.
There is an ice-cream on the table.
There are four balls under the table.
There are new words in the text.
There are two carrots in the basket.

Если мы говорим про один предмет то употребляем there is, так как связка is только для единственного числа . например,There is a boy in the classroom.
Если же мы говорим о нескольких предметах, то употребляем there are, например, There are children in the classroom. Дальше, думаю, все понятно :)