they usually change only if they are threatened
they usual change only if they be threaten
pro:sub adv v adv conj pro:sub aux part
they usually change only if they are threatened .
ð eɪ WORD_BOUNDARY j uː ʒ uː ə l i WORD_BOUNDARY t̠ʃ eɪ n d̠ʒ WORD_BOUNDARY oʊ n l i WORD_BOUNDARY ɪ f WORD_BOUNDARY ð eɪ WORD_BOUNDARY ɑː ɹ WORD_BOUNDARY θ ɹ ɛ ʔ n̩ d WORD_BOUNDARY
t h e y WORD_BOUNDARY u s u a l l y WORD_BOUNDARY c h a n g e WORD_BOUNDARY o n l y WORD_BOUNDARY i f WORD_BOUNDARY t h e y WORD_BOUNDARY a r e WORD_BOUNDARY t h r e a t e n e d WORD_BOUNDARY