Answer:
1. Tú no hablas. 
2. Tú no doblas. 
3. Tú no hierves. 
4. Tú no sigues. 
Step-by-step explanation:
When they ask us for the negative form of verbs, reference is made to the negation of an action indicated by a verb. Following the instructions, we must identify the grammatical person assigned to us and thus conjugate each verb logically and in accordance with what you want to express.