Разберёмся с первым предложением.

Специальный вопрос - When did i write a really long essay for my teacher?

Who did i write a really long essay now?

What did i write for my teacher now?

Общий - Do i write a really long essay for my teacher now?

Разделительный - I write a really long essay for my teacher now, don't i?

Теперь второе предложение.

Специальный вопрос - Who bought a car last year?

When did my dad's friend buy a car?

What did my dad's friend buy last year?

Общий - Did my dad's friend buy a car last year?

Разделительный - My dad's friend bought a car last year, didn't he?

Объяснение:

Го в геншин