Choose the correct option to complete each sentence

1. [Am I going|I am not going to] tell John what happened.
2. It's raining. [I'm going|I going] to take an umbrella.
3. Why [he going|is he going] to go there alone?
4. When [are you going|is you going] to tell the truth?
5. I've bought all the ingredients. [I'm going to|I being going] bake a cake.