had he been studying the planets and the stars
have he be study the planet and the star
v pro:sub aux part det:art n coord det:art n
had he been studying the planets and the stars ?
h æ d WORD_BOUNDARY h iː WORD_BOUNDARY b ɪ n WORD_BOUNDARY s t ʌ d i ɪ ŋ WORD_BOUNDARY ð ə WORD_BOUNDARY p l æ n ɪ t s WORD_BOUNDARY æ n d WORD_BOUNDARY ð ə WORD_BOUNDARY s t ɑː ɹ z WORD_BOUNDARY
h a d WORD_BOUNDARY h e WORD_BOUNDARY b e e n WORD_BOUNDARY s t u d y i n g WORD_BOUNDARY t h e WORD_BOUNDARY p l a n e t s WORD_BOUNDARY a n d WORD_BOUNDARY t h e WORD_BOUNDARY s t a r s WORD_BOUNDARY