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We must save them, okay? I can't live without them.

We have to save them, okay? I can't live without them.


- As I understand it the one with "must" is more emphatic than the one with "have to", right?

- But is it natural enough to be used or would native speakers just use the one with "have to"?

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In British English, 'have to' is about more general obligations; 'must' is about personal obligations.

In American English, 'have to' is almost always used in conversation; 'must' is used on official signs (Right lane must exit).

In both varieties of English, 'must' is also used to show logical deduction (The dog is scratching at the door; he must want to go out).


Being American, only "We have to save them" sounds right to me.

CJ

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anonymous- As I understand it the one with "must" is more emphatic than the one with "have to", right?

I don't really perceive that.

anonymous- But is it natural enough to be used or would native speakers just use the one with "have to"?

Both of your sentences are natural. "have to" can seem a bit more colloquial. In everyday informal speech, "have to" is probably more common, but there is nothing wrong with using "must".