Вопрос № 416. If she (to return) earlier, she would have been able to see him before he left
Ответ: had returned

Вопрос № 417. Who (to ring) you up an hour ago?
Ответ: rang

Вопрос № 418. Do you want a sandwich? – No, thanks I ______ just ______ lunch
Ответ: have ____ had

Вопрос № 419. Yesterday the children (to do) all their homework before their mother (to come) home.
Ответ: had done, came

Вопрос № 420. … your sister a typist? – No, she … not a typist, she … a student.
Ответ: is
Ответ: is
Ответ: is