Question

Past Simple
Aff:Mary            (go) to London
interrogative:
Negative:

Aff: They            (bay) a new car
interrogative:
Negative:

Aff:She            (write) an email
interrogative:
Negative:

Answer 1

Affirmative: Mary went to London
Interrogative: Did Mary go to London?
Negative: Mary didn't go to London

Affirmative: They bought a new car
Interrogative Did they buy a new car?
Negative: They didn't buy a new car

Affirmative: She wrote an e-mail
Interrogative:  Did she write an e-mail?
Negative: She didn't write an e-mail