Assertion: verb's vowel | /r/HasProperty | shortened in past tense
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Source sentences:
text: For example, before the Great Vowel Shift, the verb keep (then pronounced /keːp/, slightly like "cap" or "cape" without the j-glide) belonged to a group of verbs whose vowel was shortened in the past tense; this pattern is preserved in the modern past tense kept (similarly crept, wept, leapt, left).