My brother is studying 10 subjects at school.
Is my brother studying 10 subjects at school?
My brother is studying 10 subjects at school, isn't he?
Is my brother studying 10 or 11 subjects at school?
Who is studying 10 subjects at school?
How many subjects is my brother studying?
My friends came to see me off.
Did my friend come to see me off?
My friends came to see me off, didn't they?
Did my friends or my parents come to see me off?
Who came to see me off?
What did my friends do?