1．My father bought me an umbrella yesterday．（改为否定句）

2．That is Daniel's key ring．（改为同义句）

3．She is too weak to take part in the activity．（改为同义句）

4．I think she is as slimmer as my sister．（改错，保持句意不变）

5．Mr Wu said，“I'm satisfied with the result．”（改为间接引语）