1. Раскройте скобки, употребив формы the Future Indefinite или the Future Continuous. 1. I can't understand this letter. — I (call) my son. He (translate) it for you. 2. What you (do) when you grow up? — I (be) a pilot. 3. This time next month I (sit) on a beach. 4. In a few days time we (go) to London. 5. That tree makes the house very dark. — Very well, I (cut) it down. 6. My brother has just returned from America. — Oh, good, we (ask) him to our next party. 7. I'll come at six o'clock. — Good, I (wait) for you. 8. You look frozen. Sit down by the fire and I (make) you a cup of tea. 9. Don't ring her up at 9, she (put) her children to bed. Ring up later. 10. My son (be) in the fifth form next year. That means that he (learn) English.

I can’t understand this letter. — I will call my son. He will translate it for you.
(Первое действие — разовое обещание/решение: Future Indefinite; перевод — тоже разовое действие.)

What will you do when you grow up? — I will be a pilot.
(Речь о будущем выборе/плане в общем: Future Indefinite.)

This time next month I will be sitting on a beach.
(Конкретный момент в будущем “в это время”: Future Continuous.)

In a few days’ time we will go to London.
(Факт/план на будущее без акцента на процессе: Future Indefinite.)

That tree makes the house very dark. — Very well, I will cut it down.
(Решение, принятое прямо сейчас: Future Indefinite.)

My brother has just returned from America. — Oh, good, we will ask him to our next party.
(Спонтанное решение/намерение: Future Indefinite.)

I’ll come at six o’clock. — Good, I will be waiting for you.
(Процесс в определённый момент: “в шесть” — Future Continuous.)

You look frozen. Sit down by the fire and I will make you a cup of tea.
(Обещание/предложение сделать что-то: Future Indefinite.)

Don’t ring her up at 9, she will be putting her children to bed. Ring up later.
(Действие в процессе в конкретное время (в 9): Future Continuous.)

My son will be in the fifth form next year. That means that he will be learning English.
(“Будет в пятом классе” — состояние/факт: Future Indefinite; “будет учить” как процесс в течение периода следующего года: Future Continuous.)