I was happy yesterday.
I wasn't happy yesterday.
You were free yesterday.
You weren't free yesterday.
I was in Japan last week.
I wasn't in Japan last week.
Ken was cool last year.
Ken wasn't cool last year.
He was in the baseball club last year.
He wasn't in the baseball club last year.
She was a teacher 20 years ago.
She wasn't a teacher 20 years ago.
We were singers 30 years ago.
We weren't singers 30 years ago.
They were nice friends 20 years ago.
They weren't nice friends 20 years ago.
It was windy last night.
It wasn't windy last night.
Ken and Taro were at school last night.
Ken and Taro weren't at school last night.
They were in Korea last month.
They weren't in Korea last month.
It was snowy last week.
It wasn't snowy last week.
She was busy last night.
She wasn't busy last night.
We were friends 10 years ago.
We weren't friends 10 years ago.
You were sleepy yesterday.
You weren't sleepy yesterday.
I was in China last week.
I wasn't in China last week,
It was sunny this morning.
It wasn't sunny this morning.
He was 12 years old last year.
He wasn't 12 years old last year.