1) Ann can answer herself.
Ann can answer herself, can't she?
Can Ann answer herself?
Can Ann or Nina answer herself?
What can Ann do herself?
2) You didn't go to bed at 9 o'clock.
You didn't go to bed at 9 o'clock, did you?
Did you go to bed at 9 o'clock?
Did you go to bed at 9 or 10 o'clock?
Who went to bed at 9 o'clock?
3) Jill likes to clean her room herself.
Jill likes to clean her room herself, doesn't he?
Does Jill like to clean her room herself?
Does Jill or Lena like to clean her room herself?
What does Jill like to clean herself?
4) My friends are often late.
My friends are often late, aren't they?
Are my friends often late?
Are my friends or my teachers often late?
How often are my friends late?
5) It is cold.
It is cold, isn't it?
Is it cold?
Is it cold or warm?
What is the weather like?