1) Listen. Birds are singing. They often sing. I like to listen them.
2) This building will be built in a year. They have already done a lot.
3) Have you ever been abroad? No, I haven't. What about you? I have visited Poland 2 years ago. Did you like there? Yes
4) Pie has already cooked. My mom has finished to cook it hour ago. It will be very tasty.
5) When has the letter been written? It hasn't finished yet. I'm going to end it up tommorow
6) My homework has been finished 3 hours ago. Have you read your favourite book? Yes. I'm going to buy a new book.
7) Have your kittens been fed? Yes, my brother has already fed them. He feeds them every evening. They are too funny. We love play with them.