Поставьте эти предложения в отрицательную и вопросительную форму): We had studied French before we began to study English. she had worked at school before she began to work at the Academy. It will have stopped raining by noon .The children will have done their homework before their parents come home. l have been learning the new words for an hour,but don't remember them. It has been raining heavily all day long. my father has been reading newspaper since he came back from the office. You have been speaking on the phone for half an hour already. The boys have been playing football for 2 hours