Вопросы к предлож. English

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Предложение: the building had looked rather old last year.
Вопросы:
1) Had the building looked rather old last year?
2) Had the building looked rather old last year or not?
3) How Had the building looked rather old last year?
4)the building had looked rather old last year, hadent it?
5) What had looked rather old last year?