We have to save her, okay? I can't live without her.
We need to save her, okay? I can't live without her.
Will these be seen as completely interchangeable or is one more appropriate in the context than the other?
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Sign up to join this community“Must” is more emphatic than “have to,” which in turn is more emphatic than “need to.”
The subtle differences in emphasis are often ignored in speech and informal writing.