1.
She isn't in Moscow last month.
She wasn't in Moscow last month.
Is she in Moscow last month?
Was she in Moscow last month?
2.
They isn't watch an interesting film.
They didn't watch an interesting film.
Is they watch an interesting film?
Did they watch an interesting film?
3.
We aren't buy a present for our Granny yesterday.
We didn't buy a present for our Granny yesterday.
Is we buy a present for our Granny yesterday?
Did we buy a present for our Granny yesterday?