To form a negative sentence using a verb, you generally add “not” after the auxiliary (helping) verb or use “do not” (or “does not,” “did not”) with the main verb. Here are some examples:

1. With an auxiliary verb:

   • Positive: “She is going.”
   • Negative: “She is not going.”

2. With a main verb using “do”:

   • Positive: “He likes apples.”
   • Negative: “He does not like apples.”

3. In the past tense:

   • Positive: “They finished the project.”
   • Negative: “They did not finish the project.”

This structure helps convey that something is not happening or is untrue.