1.They're his brother.对his brother提问 2.That is your ruler.改为复数形式：_____ _____your____.
3.That is his parent._____ _____his _____.
4.在sister brother that's who mother中补全下面的对话
A：Look at the pictures.That's Jane and ___Tim.
B:Is Jane your ____?
A:Yes,she is.
B:And is Tim your ____?
A:No,he isn't.He is my friend.
B:Is she your grandmother?
A:Yes,she is .She's my father's___.