Task6. Open the brackets using the correct form of the verb in Past Simple, Past Continuous or Past Perfect. 1. By eight o'clock yesterday I (to do) my home¬work and at eight I (to play) the piano. 2. I (to go) up to the open window. The rain (to stop) and the sun (to shine) brightly. The birds in the garden (to sing). The morning (to be) fine. 3. When I (to wake) up, it (to be) already ten o'clock. I (to call) my brother. Nobody (to answer). He already (to leave). 4. When I (to see) Ann, she (to sort) the flowers which she (to pick) in the field. 5. She (to look) very tired as she (to work) hard.

By eight o'clock yesterday I had done my homework and at eight I was playing the piano.
(«By …» → завершённость к прошлому моменту → Past Perfect; действие в процессе в 8:00 → Past Continuous.)

I went up to the open window. The rain had stopped and the sun was shining brightly. The birds in the garden were singing. The morning was fine.
(Сначала прошедшее действие → Past Simple; к этому моменту дождь уже прекратился → Past Perfect; фоновые длительные действия → Past Continuous; состояние утра → Past Simple.)

When I woke up, it was already ten o'clock. I called my brother. Nobody answered. He had already left.
(Последовательные прошлые события → Past Simple; «had already left» — раньше этого момента → Past Perfect.)

When I saw Ann, she was sorting the flowers which she had picked in the field.
(Видел её в процессе действия → Past Continuous; цветы были собраны до этого → Past Perfect.)

She looked very tired as she had worked hard.
(Результат виден в прошлом, причина предшествовала → Past Perfect.)