Why do you ask so many questions about the girl living with your brother?
He has not answered my emails for many weeks. I think I know the reason why.
Why? Maybe he is just busy. He is probably too busy to write to you.
I think it is because he is in love with this girl.
Why do you say that? How do you know?
Why do I say that?
Yes, why do you say that?
We used to write each other all the time. We sent emails to each other every week. He stopped writing me.
So what? He probably has other things to do.
Now I never hear from him. He no longer writes to me.