Поделитесь своими знаниями, ответьте на вопрос:
Exercise.use the present perfect or the present perfect continuous. 1) look! somebody … (break) the window. 2) i wonder if john (forget) my number. i … (expect) him to call for the past two hours. 3) you look very upset what … (happen)? 4) you … (not / finish) that book yet? you … (read) it since monday. 5) the meat must be nearly ready. i … (cook) it for nearly an hour. 6) what you (do) for the last two hours? -i (sit) here working at this problem.