Проверти, помогите и со вторым надо так же сделать!

1) We were in the camp last summer.

We weren't in the camp last summer?

Weren't we in the camp summer?

2) My mother was at the concert yesterday

Если второе предложение - отрицание, то следует убрать вопрос)))

Третье в принципе правильно. Но зачем отрицать в вопросе, если в исходном предложении утверждение? Я бы написала так:

Were we in the camp last summer?

My mother was at the concert yesterday.

My mother wasn't at the concert yesterday.

Was my mother at the concert yesterday?