Forty is the number that is after thirty-nine and before forty-one.
f ɔ ɹ t i WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ə WORD_BOUNDARY n ʌ m b ə ɹ WORD_BOUNDARY ð æ t WORD_BOUNDARY ɪ z WORD_BOUNDARY æ f t ə ɹ WORD_BOUNDARY θ ɜː t i n aɪ n WORD_BOUNDARY æ n d WORD_BOUNDARY b ɪ f ɔ ɹ WORD_BOUNDARY f ɔ ɹ t i w ʌ n WORD_BOUNDARY