Must I? = answer with 'need' or 'must'

[ademoglu]

Hello,

A: Must I pay now?
B: No, you needn't. / No, you musn't.

A: Need I pay now?
B: Yes, you must. / Yes, you need.

They are my sentences. I would like to ask whether or not all the answers are possible, depending on the context.

Thanks.

 

[Matthew Wai]

No, you musn't.

I take 'you mustn't do something' to mean 'you shouldn't do something', which doesn't seem a correct answer to the question.
Not a teacher.

Yes, you need.

The modal verb 'need' is usually not used in the affirmative.

 

[MikeNewYork]

None of the answers are natural.

 

[Matthew Wai]

Would you mind telling us what answers are natural?

 

[Barb_D]

No, you don't have to [pay now].

Yes, you have to pay now.
Yes, you must pay now.

 

[Tdol]

Yes, you have to pay now.
Yes, you must pay now.

In addition to these, Yes, you do sounds OK to me.