Теорія:

Study some information about the verb 'to be' in the Past Simple.
Щоб повідомити про те, де ви були вчора або декілька хвилин тому, потрібно вживати дієслово to be у минулому часі.
Розглянемо, як будуються стверджувальні речення з дієсловом to be.
 
I was

you were

he, she, it was

We were

You were

They were
 
Examples:

I was at school yesterday.

My friend was in the shop last Sunday.
  
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Щоб повідомити про те, що вас десь не було або означений предмет не має таких властивостей, потрібно вживати дієслово to be + частка not.
was not

you were not

he, she, it was not

We were not

You were not

They were not
    
Examples:
  
They were not at the party.
  
Mary wasn't happy.
  
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Запам'ятайте скорочені форми заперечення:
 
was not = wasn’t

were not = weren’t
Джерела:
http://www.papawestray.co.uk/papay-shop.html
http://www.thejournal.ie/unhappy-people-dont-die-younger-2491663-Dec2015/