Future With "Going to": Form

Affirmative (Positive)

I am going to play football tonight

Form: Subject + am/is/are + going to + verb (infinitive)

Negative

I am not going to play football tonight

Form: Subject + am/is/are + not + going to + verb (infinitive)

Question (Interrogative) 

Are you going to play football tonight?

Form: Am/is/are + subject + going to + verb (infinitive)