Forming negative sentences for future tenses is simple because the general structure remains the same across all future tenses. You just add "not" after the auxiliary verb (will or be) to negate the sentence. If you remember how to do it with simple future tense, you will have no trouble doing it with other future tenses.
Examples:
- I will be working tomorrow at this time. -> I …
2. She will be watching TV tomorrow afternoon.
3. They are going to be playing football tonight.
4. She will be teaching at 10 AM tomorrow.
5. They are going to be studying for the exam tonight.