What is the percentage of "have to" pronunciation as voiced and unvoiced ?
Which one do you commonly say ? unvoiced or voiced for the same word "have to","has to", and "had to" ?
have to - Definition and pronunciation | Oxford Advanced Learners Dictionary at OxfordLearnersDictionaries.com
In normal conversation in standard BrE, we almost aways use the unvoiced vowels /f/, in have to; /s/, in has to; and /t/ in had to. Some of us use the voiced equivalents, but only in slow, careful speech .