musta been pretty quick
must have be pretty quick
mod v aux adj adv
musta been pretty quick .
m ʌ s t ə WORD_BOUNDARY b ɪ n WORD_BOUNDARY p ɹ ɪ ɾ i WORD_BOUNDARY k w ɪ k WORD_BOUNDARY
m u s t a WORD_BOUNDARY b e e n WORD_BOUNDARY p r e t t y WORD_BOUNDARY q u i c k WORD_BOUNDARY