Нужно сделать :

3 предложения с were/weren’t

3 предложения с was/wasn’t

2 предложения с could/couldn’t

They weren’t at home yesterday

The key wasn’t in the car

He was in the library

There was a very old house at the end of the street

There were six apples in the box

Michel was incredibly fond of dancing

I could rely on them because they were good at that job

I thought you were in a hurry

They were walking together in the park

Last time I saw them, they were not married

His parents were not doctors, they were teachers

When I came back home last night, the cat was not

I passed the exam. It was not difficult

I could swim when I was 10

You could be quiet at least. I’m trying to work.

My mom said my friends could not stay at my place.

Mary couldn't possibly go to jail for the crime.