Ask the questions and answer them:

I watched the film.

Did you watch the film? Yes, I did. No, I didn't.

She closed the door.

Did she close the door? Yes, she did. No, she didn't.

We played tennis yesterday.

Did you play tennis yesterday? Yes, we did. No, we didn't.

He opened the window.

Did he open the window? Yes, he did. No, he didn't.

Mary phoned me an hour ago.

Did Mary phone you an hour ago? Yes, she did. No, she didn't.