The Great Vowel Shift happened after Chaucer, but was mostly complete by Shakespeare's time. One important change in vowels that didn't happen yet by Shakespear

The Great Vowel Shift happened after Chaucer, but was mostly complete by Shakespeare's time. One important change in vowels that didn't happen yet by Shakespeare's time was the unrounding of short u, that is, the modern sound in words like cut, but, knuckle, lust, blood, etc. All those words sounded like "put" during Shakespeare's time, and of course move/love was a real rhyme.