When forming a tag question for a statement with a positive verb, the tag question should be negative, and vice versa. For the sentence 'You’ve met her before, _______?', what is the correct tag question?

Tag questions are often used to seek confirmation or agreement. For an imperative sentence like 'Let’s go for a walk, _______?', which tag question is appropriate?

Sentences with indefinite pronouns like 'nobody', 'everybody', 'somebody', etc., as the subject require a specific pronoun in the tag question. For 'Nobody told you the truth, _______?', what is the correct tag?

Adverbs of frequency like 'rarely', 'seldom', 'hardly', 'scarcely' often make a statement negative in meaning. For 'She rarely eats junk food, _______?', what is the correct tag question?