premise: A young boy is sitting in a green tunnel
hypothesis: The boy is sitting
explanation_1: A boy by definition is young and, if sitting, could be sitting in a tunnel.
explanation_2: If the boy is sitting in a green tunnel, he is obviously sitting, regardless of the location.
explanation_3: The boy is sitting is stated in both sentences.  The pronoun young describes the boy and green tunnel states where.  However, it is clearly stated that the boy is sitting.
premise_logic: exists e1 s1 s2 x1 x2.(in(e1,x2) & n_tunnel(x2) & a_green(s2) & Theme(s2,x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 x1.(n_boy(x1) & Actor(e1,x1) & v_sit(e1))
premise_sim: exists e1 s1 s2 x1 x2.(v_sit(e1) & n_tunnel(x2) & n_boy(x1) & in(e1,x2) & a_young(s1) & a_green(s2) & Theme(s2,x2) & Theme(s1,x1) & Actor(e1,x1))
hypothesis_sim: exists e1 x1.(v_sit(e1) & n_boy(x1) & Actor(e1,x1))