помогите безотлагательно)))не понимаю )))буду признателен)

We often do our lessons when we are at school.
My mother hurt her finger, when she cooked dinner.
The girl did her homework quickly.
My car is dirty and dusty after rain.
My husband broke my chair on Friday.
I had my final exam three hours ago.
Many million years ago, primitive people lived in caves.
They took the book from the library the day before yesterday.