Change the structure as in the example 1) this is our puppe. - this is 2) this is ist toy. - this is 3) this is his bike. - this 4) this is our hoise. - this is 5) this is their office. - this is

1) This is our puppy. - This puppy is ours.
2) This is his a toy. - This toy is his.
3) This is his bike. - This bike is his.
4) This is our house. - This house is ours.
5) This is their office. - This office is theirs.