5 типов вопросов к предложениям He made a lot of mistakes yesterday.
И второе He is doing his homework now.
1.Общий вопрос
2.Специальный вопрос
3.Альтернативный вопрос
4.Разделительный вопрос
5.Вопрос к подлежащему

did he make many mistakes yesterday
when did he make many mistakes
did he make many yesterday or the day before yesterday
he made a lot of mistakes yesterday, didn't he
who made many mistakes yesterday

is he doing the homework now
what is he doing now
is he doing his homework or surfing the net now
he is doing his homework now, isn't he
who is doing homework now