Question

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

Answer 1

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.

Answer 2

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 :)