Assertion: diphthong | /r/CapableOf | change to monophthong
Facets:
Source sentences:
text: To begin with, the diphthong may change to a monophthong by the dropping of the second element and slight lengthening of the first element: /aɪ/→[aː], /aʊ/→[ɑː], /eɪ/→[eː], /əʊ/→[ɜː].