Раскройтескобки, употребляягла­голыв past simple, past continuous и past perfect. 1. i (to sit) in an armchair and (to think) of my coming trip across the north sea when the door suddenly (to open) and an old friend of mine whom i (not to see) for a very long time (to enter) the room. 2. she (to come) to see us just at the time when we (to have) dinner. it (to be) the first time i (to see) her. 3. i (to see) him just as he (to leave) the hotel. 4. i (not to see) him before we (to meet) at the concert. 5. he (to leave) the house before i (to have) time to ask him anything. 6. he (to tell) me he (to learn) it from the newspaper. 7. he (to enter) the room, (to take) something from the desk and (to go) out. 8. there (to be) two men in the room. one of them (to write) something while the other (to read) a newspaper. 9. he (not to tell) me that he (to receive) a telegram from her.

Ниже приведены предложения с раскрытыми скобками. Глаголы употреблены в соответствующих временах: Past Simple (для последовательных действий или констатации факта), Past Continuous (для длительных процессов в прошлом) и Past Perfect (для действий, совершившихся ранее других событий в прошлом).

1. I was sitting in an armchair and thinking of my coming trip across the North Sea when the door suddenly opened and an old friend of mine whom I had not seen for a very long time entered the room.
2. She broke (или came) to see us just at the time when we were having dinner. It was the first time I had seen her.
3. I saw him just as he was leaving the hotel.
4. I had not seen him before we met at the concert.
5. He had left the house before I had time to ask him anything.
6. He told me he had learned it from the newspaper.
7. He entered the room, took something from the desk and went out.
8. There were two men in the room. One of them was writing something while the other was reading a newspaper.
9. He did not tell me that he had received a telegram from her.

Краткие пояснения к использованию времен:

• Past Continuous используется в предложениях 1, 2, 3, 8 для описания процесса, который происходил в определенный момент (сидел, обедали, уходил, писали/читали).
• Past Perfect используется в предложениях 1, 2, 4, 5, 6, 9 для обозначения действия, которое произошло до другого момента в прошлом (не видел до этого, ушел раньше, чем я успел спросить, узнал заранее).
• Past Simple используется для обозначения внезапных действий, которые прервали процесс, или для перечисления последовательных событий (открылась дверь, вошел, взял, вышел).

Могу также составить для вас таблицу с формулами образования этих времен или подготовить аналогичные упражнения для закрепления материала.