Sometimes words were modified in one grammatical circumstance but left untouched in another. That is why we have knife with an f but knives with a v. Other such pairs are half/halves, grass/graze, grief/grieve, calf/calves. Sometimes there was a spelling change as well, as with the second vowel in speech and speak. Sometimes the pronunciation changed, as between bath and bathe and as with the “s” in house becoming a “z” in houses. And sometimes, to the eternal confusion of non-English speakers, these things happened all together, so that we have not only the spelling doublet life/lives but
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