5 типов вопроса к предложению: Mary had returned by 10 o'clock yesterday.
1) Had Mary returned by 10 o'clock yesterday? 2) Who had returned by 10 o'clock yesterday? 3) What had Mary done by 10 o'clock yesterday? 4) When had Mary returned? 5) How much time was when Mary had returned yesterday?
Спасибо)