was/were

Глагол to be в прошлом времени (Past Simple) имеет форму was/were.
Was для : I, he, she, it
Were для : you, we, they
+ Положительное предложение имеет форму:

I	was
he
she
it
you	were
we
they

 
It was a nice day yesterday.- Вчера был хороший день
We were in London last week.- На прошлой неделе мы были в Лондоне.

- Отрицательное прдложение имеет форму: 

I	was not (wasn’t)
he
she
it
you	were not (weren’t)
we
they

 
It was not a nice day yesterday.- Вчера не был хороший день
We were not in London last week.- На прошлой неделе мы не были в Лондоне.

? Вопросительное предложение имеет форму:

Was	I?
	he?
	she?
	it?
Were	you?
	we?
	they?

 
Was it a nice day yesterday?- Вчера был хороший день?
Were we in London last week?- Мы были в Лондоне на прошлой неделе?

Проспрягаем предложение "быть дома"
I was at home.                          I wasn't at home.                                 Was I at home?
He was at home.                      He wasn't at home.                               Was he at home?
She was at home.                     She wasn't at home.                             Was she at home?
You were at home.                   You weren't at home.                            Were you at home?
We were at home.                    We weren't at home.                            Were we at home?                 
They were at home.                  They weren't at home.                          Were they at home?

Короткие ответы:

Yes	I, he, she. It	was
	you, we, they	were

 
- Was Tom at work yesterday? "Yes, he was."

No,	I, he, she. It	wasn't
	you, we, they	weren't

                     
- Were you late? "No, I wasn't"
- Were they at the party? "No they weren't"