Краткий ответ:
- She was in the park.
- Her friends were in the park too.
- The day was hot and sunny.
- The flowers were red, blue and pink.
- Her brother was in the tree house.
- We were at the circus.
- You were funny.
- I was at home.
Как понять правило:
В прошедшем времени глагол to be имеет две формы:
was — с I, he, she, it и с одним предметом/человеком:
I was, she was, the day was, her brother was.were — с we, you, they и с множественным числом:
we were, you were, they were, her friends were, the flowers were.
Как проверять себя: сначала найди, кто или что выполняет действие. Если это «он/она/оно» или один предмет — ставим was. Если «мы/вы/они» или много предметов — were.
Например: Her friends — это «её друзья», их много, значит were. Her brother — один брат, значит was.