Use the going-to future for events in the future that are planned and you are certain they will happen.
For example: I am going to play tennis tonight.
Form the going-to future by using the correct form of "to be" + going to + the infinitive of the verb.
Negations: I am not going to play tennis tonight.
For questions: put the correct form of "to be" at the front of the sentence: Are you going to play tennis tonight?