He does not have a leg.
Explanation:
- To form a negative sentence, we usually use the auxiliary verb "do" in its negative form ("do not" or "does not" depending on the subject).
- Here, the subject is "he" and we need to use "does not" because it is the third person singular present tense form of "do not".
- The main verb is "have" and we simply add "not" after it to make it negative.
- Therefore, the negative sentence is "He does not have a leg." which means the person referred to does not possess one of their legs.