1) I've already done my homework. 2) They have just gone to the park. 3) We've just written our tests. 4) My brother has already had his dinner. 5) Our teacher has already checked our dictation. 6) My friend hasn't come yet. 7) We haven't had breakfast yet. 8) Alex has already read this book. 9) I haven't written my report yet. 10) We have already swept the floor.