1. Is it winter?
What is it?
Is it winter or autumn?
It is winter, isn't it?
2. Were there three mistakes in my text?
How many mistakes were there in my text?
Were there three or four mistakes in my text?
There were three mistakes in my text, weren't there?
3. Does our friend often invite us to the parties?
Where does our friend often invite us?
Does our friend often invite us to the parties or performances?
Our friend often invites us to the parties, doesn't he?
4. Will I try to to pass the exams again next time if I don't do it?
What will I do if I don't pass the exams?
Will I try to pass the exams again next time or in a couple of years if I don't do it?
If I don't pass the exams I'll try to do it again next time, won't I?
5. Does he often read detective stories?
What does he often read?
Does he often read detective stories or fairy tales?
He often reads detective stories, doesn't he?