Question tags

[sarah tappeiner]

Test No. incompl/elem-36 "Question Tags (2)", question 9

Sarah: 'You mustn't eat with your mouth full.'
Paul: '.........'

(a) Oh I must, must I?
(b) Oh I can't, can I?
(c) Oh I have to, have I?
(d) Oh I mustn't, must I?

Test No. incompl/elem-36 "Question Tags (2)", answer 9

Sarah: 'You mustn't eat with your mouth full.'
Paul: 'Oh I mustn't, must I?'

Correct answer: (d) Oh I mustn't, must I?
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Can you please tell me the right question tag for the following sentence (and give me the explanation for it please):
"We must go now"

[Alan]

We must go, mustn't we? Expecting the answer yes follows the pattern: Positive main part we must Negative second part or tag: mustn't we?
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English as a Second Language
You can read my ESL story A funny thing happened...