Напишыте 10 предложений present perfect

I have alredy done my homework.
They have come back today.
We nave never been to England.
I have not seen my friends since the holidays.
My mother has not answered the letter yet.
I have already had my dinner.
I have been very busy lately.
They have not heard the news yet.
Have you ever been to this museum?
I have just sent the letter to my parents.