用when造三个句子。

When I was young,I used to have so much time.
When she came here,I was studying.
When is your birthday?

1. when i came back, it started to rain.
2. when i finished my homework, my sister was watching TV.
3. when you are studying, i am reading my book.

when will we meet again?
when is the exam?
when will it stop rainning?

when did you get up this momring?
when will you go to school?
when will you clean your room?