Задайте к этому предложению пять вопросов (общий, альтернативный, разделительный, специальный, вопрос к подлежащему).
By 8 o'clock yesterday he had done his homework

By 8 o'clock yesterday he had done his homework

Общий

Had he done his homework by 8 o'clock yesterday?

Специальный

By what time had he done his homework yesterday?

К подлежащему

Who had done the homework by 8 o'clock yesterday?

Альтернативный

Had he done his homework by 8 o'clock yesterday or the day before yesterday?

Разделительный

By 8 o'clock yesterday he had done his homework, hadn't he?