premise: A doctor is performing surgery.
hypothesis: A doctor is doing a good job.
explanation_1: A doctor performing surgery may not be doing a good job.
explanation_2: Not every doctor does a good job as a surgeon.
explanation_3: The quality of the job the doctor is doing is unknown. We can't tell from the first sentence whether the doctor is doing a good job.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_surgery(x2) & n_doctor(x1))
hypothesis_logic: exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_job(x2) & a_good(s1) & Theme(s1,x2) & n_doctor(x1))