There is a sheep on the hill.改成复数 Mary is going to draw pictures.改成否定句你们的答案都不一样，我信谁的啊，真是难啊！

There are many sheep on the hill.【sheep单复数同形】
Mary isn't going to draw pictures.
有不会的可以再问我

There are some sheep on the hill
Mary isn't going to draw pictures

There is a sheep on the hill.改成复数
There are sheep on the hills.
Mary is going to draw pictures.改成否定句
Mary isn't going to draw pictures.

There are sheep on the hill.
mary won't go to drwa pictures.

there are sheep on the hill
mary is not going to draw pictures

There are some sheep on the hill。---sheep 单复同形
Mary isn't going to draw pictures.
希望帮到你 祝进步