1). I to did morning exercise.

Did I morning?

I didn't exercise was.

2). He to worked at a factory.

Did he worked?

He didn't worked was at a factory.

3).She to slept after dinner.

Did she to slept?

She didn't to slept was after dinner.

4). We to worked part - time.

Did we to worked?

We didn't to work were part - time.

Так дальше и делаешь по принципу.

Это формула, как составлять предложения в Past Simple:

1).Подлежащее + сказуемое с окончанием -ed, (либо неправильная форма)

2). Did подлежащее + сказуемое с окончанием -ed, (либо неправильная форма) ?

3). Подлежащее didn't сказуемое was/were.