Ответ:

I.

? : Is he a pilot?

+  : He is a pilot

- : He is not a pilot

Объяснение о построении предложений в Present Simple (to be):

+ : I/You, we, they/He, she, it + am/are/is + ...

- : I/You, we, they/He, she, it + am not/are not/is not + ...

? : Am/Are/Is + I/You, we, they/He, she, it + ... ?

II.

- : They didn't help the cat

+  : They helped the cat

? : Did they help the cat?

Объяснение о построении предложений в Past Simple (V):

+ : I, you, we, they, he, she, it + V2/Ved

- : I, you, we, they, he, she, it + didn't + V1

? : Did + I, you, we, they, he, she, it + V1 ?