Mona couldn't sleep well (because she would have a test)
Mona couldn't sleep well (because she would have a test) ()()Mona sleep well? The tennis racket might belong to (Tommy)对划线部分提问 ()()the tennis racket belong to
Mona couldn't sleep well (because she would have a test) (Why)(couldn't)Mona sleep well? The tennis racket might belong to (Tommy)对划线部分提问 (Who)(might)the tennis racket belong to