Negative answers

If the answer to a question is 'no', you may omit the main verb.

Examples:

Question Answer Answer
  Informal, spoken language Emphatic spoken and formal language
Will she come to the party tomorrow? No, she won't. No, she will not.
Has Tom finished the report? No, he hasn't. No, he has not.
Do you study Russian this semester? No, we don't. No, we do not.