Question

Найдите два предложения с ошибками и исправь их. Запиши предложения правильно.
What did he repair his bike yesterday?
Why did Mike get up early?
When did she bought apples?

Answer 1

What did he repair his bike yesterday? – What did he repair yesterday?
Why did Mike get up early? (правильно)
When did she bought apples? – When did she buy apples?

Answer 2

What did he repair his bike (что? велосипед) yesterday? – вопрос к подлежащему -- What did he repair yesterday? 
Why did Mike get up early? все верно
When did she bought (вторая форма!) apples? – When did she buy apples?