premise: An older man is speaking to a boy while both are sitting.
hypothesis: Grandpa is lecturing
explanation_1: An older man should not always mean a Grandpa and speaking while sitting and lecturing are totally different
explanation_2: Just because an older man is speaking to a boy doesn't mean he is the boy's Grandpa.
explanation_3: If an older man is speaking to a boy it does not mean that he is a grandpa who is lecturing the boy.
premise_logic: exists e1 p1 s1 x1 x2.(exists e2 x3.(Actor(e2,x3) & v_sit(e2) & n_thing(x3)) & while(e1,p1) & to(e1,x2) & n_boy(x2) & Actor(e1,x1) & v_speak(e1) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 x1.(ne_geo_grandpa(x1) & Actor(e1,x1) & v_lecture(e1))
premise_sim: exists e1 p1 s1 x1 x2.(while(e1,p1) & v_speak(e1) & to(e1,x2) & r_more(s1) & n_man(x1) & n_boy(x2) & exists e2 x3.(v_sit(e2) & n_thing(x3) & Actor(e2,x3)) & a_older(s1) & Theme(s1,x1) & Actor(e1,x1))
hypothesis_sim: exists e1 x1.(v_lecture(e1) & ne_geo_grandpa(x1) & Actor(e1,x1))