2. It isn't very windy. It wasn't

Для выполнения задания необходимо изменить предложение, используя слова yesterday, the day before yesterday, last night, last month, two days ago, last Monday.

В данном случае используем слово last night.

2. It isn't very windy. It wasn't very windy last night.

Ответ: It wasn't very windy last night.