5 предложений в 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.Здесь 10предложений)