WAS/ WERE

My parents are / were talkative

The dog was very dangerous

We were hilarious

You were funny

We were hard working people

I was  yawning

I was nodding

I was sneezing

was coughing

WAS/ WERE

 I was here yesterday.

You were happy yesterday.

She was sad yesterday.

Were you happy yesterday?

Was it your birthday yesterday?

Was she sad yesterday?

I wasn't sad yesterday.