As we all know, the Early Modern English 3sg verbal ending -eth has become -s in Modern English. This presumably happened in two steps:
- Elision of the unstressed e in the final syllable
- Changing final -th to -s.
But do we know what order these changes happen in? Do we find intermediate forms like speak'th (with elided vowel but no consonant change) or speakes (with consonant change but the vowel preserved)?