The brother is writing.

Did you write down Tom's phone number?

My friend Marcelo writes in Latin.

I'll make sure Tom and Mary write to you.

Write it in pencil.

Did you ever write to Sir Charles asking him to meet you?

I don't write to Tom anymore.

If I had known his address, I would have written.

I had written the letter when he came.

Tom and Mary began writing poetry when they were thirteen.