Question

3- Mude para a interrogativa e depois negativa.(use o did e didnt e mude o verbo)

a- We saw a film about ecology last class.
Interrogativa:
Negativa:

b - They stopped polluting the sea.
I:
N:

c - Jonas took his students to the conference.
I:
N:

Answer 1

Resposta:

A)

Interrogativa: Did you saw the film about ecology last class?

Negativa: We didn't saw the film about ecology last class.

B)

Interrogativa: Did they stopped polluting the sea?

Negativa: They didn't stopped polluting the sea.

C)

Interrogativa: Did Jonas took his students to the conference?

Negativa: Jonas didn't took his students to the conference.

Answer 2

Resposta:

Did we see a film about ecology last class?

we didn't see a film about ecology last class

Did they stop polluting the sea?

They didn't stop polluting the sea.

Did Jonas take his students to the conference?

Jonas didn't take his students to the conference.

Explicação:

Sempre que for passar a frase do passado para a negativa e interrogativa , usar o auxiliar did.

Interrogativa:

Did + sujeito +verbo no infinitivo + resto da frase

negativa

sujeito + didn't + verbo no infinitivo+ resto da frase