they learned how to make fire
they learn how to make fire
pro:sub v pro:int inf v n
they learned how to make fire .
ð eɪ WORD_BOUNDARY l ɜː n d WORD_BOUNDARY h aʊ WORD_BOUNDARY t ə WORD_BOUNDARY m eɪ k WORD_BOUNDARY f aɪ ɚ WORD_BOUNDARY
t h e y WORD_BOUNDARY l e a r n e d WORD_BOUNDARY h o w WORD_BOUNDARY t o WORD_BOUNDARY m a k e WORD_BOUNDARY f i r e WORD_BOUNDARY