Ответ:
I was at home yesterday.
I was not at school.
My grandparents were at home too.
We were not sad.
We were happy.
Where were you?
Объяснение:
Время Past Simple:
Образование с глаголом to be: подлежащее + was/were (ед и мн число) + not (если есть отрицание) + все остальное.