they are my friend和these are my friend改错

they are my friend和these are my friend改错 These are my friend ( ) they are my friend This is my friend.These are my friend. Most of my friend are student 改错 this are my friend,amy改错 ( )my good friend,Kate and Mary.选they are还是these are? 为什么 they are a( ) my best friend your are my friend. This is my friend 和 These are my sist 改成否定句怎么改啊,急... What are these girls?They are my cousins.【改错】 my friend's clothes are i____.They are cheap.