think he fell down
think he fall down
v pro:sub v adv
think he fell down .
θ ɪ ŋ k WORD_BOUNDARY h iː WORD_BOUNDARY f ɛ l WORD_BOUNDARY d aʊ n WORD_BOUNDARY
t h i n k WORD_BOUNDARY h e WORD_BOUNDARY f e l l WORD_BOUNDARY d o w n WORD_BOUNDARY