Раскройте скобки и задайте к предложению вопросы: к подлежащему ,специальный , альтернативный , разделительный . he ( to help ) his mother yesterday

К подлежащему
Who helped his mother yesterday?
специальный
When did he help his mother?
альтернативный
Did he help his mother or his father yesterday?
разделительный
He helped his mother yesterday, didn't he?

He helped his mother yesterday
К подлеж:Who helped mother yesterday?
Спец: What did he do yesterday?
Альтернат: Did he help his mother yesterday, or not?
Раздел: He helped his mother yesterday, didn’t he?

не очень уверена в альтернативном