Don't have to or won't have to ?

[GentleBoy]

Example-

Won't you have to go out now? Shall I lock the gate then?

In my understanding we should use "will have to" for "obligation+certainty". Is the above sentence unnatural.
Is it better way to say

"Don't you have to go out now? Shall I lock the gate then?".

 

[Raymott]

Example-

Won't you have to go out now? Shall I lock the gate then?

In my understanding we should use "will have to" for "obligation+certainty". Is the above sentence unnatural.
Is it better way to say

"Don't you have to go out now? Shall I lock the gate then?".

Your first sentence is not right. The second one is. We are talking about 'now'. Why do you want to use a future construction?

 

[GentleBoy]

It's all right. Let me omit "now" from the sentence. Which sentence I should use .

Won't you have to go out ? Shall I lock the gate then?
OR
"Don't you have to go out ? Shall I lock the gate then?".


Thanks.

 

[BobK]

'Won't' would work in a few contexts (as long as you don't say 'now'), but 'don't' is much more likely; and I feel that with a future (won't) you'd be more likely to use some more 'assertive' verb, like 'get out'.

b