1) Their family invited everybody to the party last Sunday.2) We have already written a composition.3) They have been playing football for two hours.4) He goes to his work by bus.1) If he breaks the window he will pay for a new one.2) The trains would all stop if it snowed heavily.3) If I saw a cheap second-hand car I would buy it.4) You would not have a stomachache if you didn't eat too much of that cake.5) The doctor would have seen you yesterday if you had come at ten.