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Please, tell me if it is correct to say:

What do I must do? or: What must I do?
When does Ann must go? or: When must Ann go?

Must I not do? or: Don’t I must do? or: Mustn’t I do?
What don’t I must do? or: What must I not do?

Did I must do?
Didn’t I must do?
What did I must do?
What didn’t I must do?

You’ll must to talk to her. She’s your mother-in-law anyway! Or:
You’ll have to talk to her. She’s your mother-in-law anyway!
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What must I do?

When must Ann go?

'Must'nt I?'

What must I not do?

Erm...none of the next group make too much sense to me. 'What should I have done?'????

You must talk to her or You'll have to talk to her.
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"does"/"do" OR "must", but not both!
"does"/"do" OR "will", but not both!
"must" OR "will", but not both!

Do you go? / Don't you go?
Must you go? / Mustn't you go?
Will you go? / Won't you go?

Do you talk to her? / Don't you talk to her?
Must you talk to her? / Mustn't you talk to her?
Will you talk to her? / Won't you talk to her?

What does he do? / What doesn't he do?
What must he do? / What mustn't he do?
What will he do? / What won't he do?

What do you do? / What don't you do?
What must you do? / What mustn't you do?
What will you do? / What won't you do?

I will must, I do must, I do will, etc. are all incorrect.

Hope that helps.
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What do I must to do
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Well............. if you use must with ill then use should

AnonymousWhat do I must to do

No.

CJ