It (was - is - were) very hot last summer.
was
I am at the cinema with my friends.
I was at the cinema with my friends (yesterday)
Library / the / they / at / were
They were at the library
It (was - is - were) very cold this winter.
is
He isn't very nice.
He wasn't very nice.
not / yesterday / gym / I / at / was
I wasn't at the gym yesterday
We (are - were - was) in Cusco last week.
were
this week
last week
was/ it / great
It was great
(Was - Is - Were) he in Brazil last week?
Was
We are students but we aren't at school, it's Sunday.
We are students but we weren't at school, it was Sunday.
the / was / ? / what / weather / yesterday / like
What was the weather like yesterday?
You (was - wasn't - weren't) here in class yesterday.
weren't
How is your day?
How was your day?
last / here / you / ? / night / were
were you here last night?