Ответ:

1. Did Mr.Brown walk to his office? 2. Did the boys try to understand the lesson? 3. Did you believe what he said? 4. Did he write to his brother every day? 5. Did the baker sell good cakes? 6. Did the lesson begin at nine o’clock? 7. Did they all go to the football match? 8. Did she say she was very busy? 9. Did Mr. Smith catch the eight o’clock train? 10. Did we buy that fruit from Greece?

Все предложения написаны в прошедшем времени( Past Simple Tense), вопросительная форма строится при помощи Did + далее Подлежащее + глагол в первой форме если это неправильный глагол или без окончания ed, если это правильный глагол.