Choose the correct from of the verb: 1. I (did, had done) shopping by 3 o’clock yesterday. 2. Ye (had received, received) the telegram by that time. 3. My brother (tried on, had tried on) the raincoat before he (bought, had bought) it. 4. They (went, had gone) window-shopping yesterday. 5. We (bought, had bought) vegetables before our mother (had come, came) home.

Вот правильные формы с кратким объяснением выбора:

1. I had done shopping by 3 o’clock yesterday.
   «By 3 o’clock yesterday» указывает на завершённость к определённому моменту в прошлом → Past Perfect.

2. We had received the telegram by that time.
   (Скорее всего опечатка «Ye» = «We».) «By that time» снова сигнал Past Perfect: действие завершилось к тому моменту в прошлом.

3. My brother had tried on the raincoat before he bought it.
   «Before» задаёт последовательность: примерка раньше покупки → первое действие Past Perfect, второе Past Simple.

4. They went window-shopping yesterday.
   Обычное прошлое время с «yesterday» → Past Simple.

5. We had bought vegetables before our mother came home.
   Покупка произошла раньше прихода → предшествующее действие в Past Perfect, последующее в Past Simple.