They are boy这句话中哪里有错?

They are boy这句话中哪里有错? They are playing football on the grass.这句话哪里有错 They went camp in the mountain 这句话哪里有错 They are your kite哪里有错 He are in Class One.这句话哪里有错? We are from china.这句话哪里有错? Are (these) (cup) (new)?Yes,(they) are.哪里有错 They are in the different class 哪里有错? 指出哪里有错：They are my brother balls Are they usually have rice for supper?这句话中哪里有错误 如何改正 They are going to go boating.这句话有没有错啊? They are going to go boating.这句话有没有错啊?快 They are now married and pleased with each other.这句话有错吗?为什么? they are we friends他们是我们的朋友,这句话有错吗 Sam and I are in different class.这句话哪里有错? What are the quality of a good teacher?这句话哪里有错?为什么 because we are friend,isn't right?这句话哪里有错? There are three rolls of films .这句话有错吗?错在哪里?