Why is have to usually pronounced half to?

asked 2017-07-21 04:35:21 -0400

PDub gravatar image

I've noticed that many (most?) people pronounce "have to" as "half to" or "hafta." Why is this? Is it peculiar to [North] American speech or does it occur in other varieties of English? I'm having difficulty thinking of other cases where v is pronounced as f. Is there a name for this phenomenon?

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