—Is this red bag yours?—No, it isn’t.          is that black one.

— My father has just bought          a new computer.— Really? How lucky are!

We don’t know _________. She is new here.

– Do you know the girl       is drawing the pictures under the tree?—Yes . She is my new classmate.

-- Is that _________ sister, Dave? -- No, it isn’t. She is my friend.