She was angry. That is why she remained silent.

She explained the reason why she was late.

Why didn't they draw up a passenger list?

It is still a mystery why she killed herself.

I wonder why she is so worried.

Why don't you tell her directly?

Why don't you drop her a line?

Please explain the reason why she was arrested.

Do you know why they stopped talking?

He asked her why she was crying.