they must be because ten years old is so old
they must be because ten year old be so old
pro:sub mod cop conj det:num n adj aux adv adj
they must be because ten years old is so old .
ð eɪ WORD_BOUNDARY m ʌ s t WORD_BOUNDARY b iː WORD_BOUNDARY b ɪ k ʌ z WORD_BOUNDARY t ɛ n WORD_BOUNDARY j ɪ ɹ z WORD_BOUNDARY oʊ l d WORD_BOUNDARY ɪ z WORD_BOUNDARY s oʊ WORD_BOUNDARY oʊ l d WORD_BOUNDARY
t h e y WORD_BOUNDARY m u s t WORD_BOUNDARY b e WORD_BOUNDARY b e c a u s e WORD_BOUNDARY t e n WORD_BOUNDARY y e a r s WORD_BOUNDARY o l d WORD_BOUNDARY i s WORD_BOUNDARY s o WORD_BOUNDARY o l d WORD_BOUNDARY