Deduction and obligation Question tags

[JMCGHK]

Dear all,

Which is correct in each sentence?


1. He must work late, mustn’t/must he?
2. He mustn’t work late, must/mustn’t he?
3. Red must be one of the most powerful colours, is/isn't it?
4. He must be a bus driver, is/isn’t/must/can’t he?
5. He must know, does/doesn’t/must/can’t he?
6. He might know, does/doesn’t/might/mightn’t he?

Thx

[heidita]

JMC, why not post your answers first, then we can discuss the mistakes.

cheers