A man catches a ball in front of a large crowd.
The baseball player dropped the ball.
Sentence 1 states that the subject successfully catches the ball, and therefore, did the ball was not dropped.
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & in(x2,x3) & of(x3,x4) & n_crowd(x4) & a_large(s1) & Theme(s1,x4) & n_front(x3) & n_ball(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_ball(x3) & n_player(x1) & of(x1,x2) & n_baseball(x2) & Theme(e1,x3) & Actor(e1,x1) & v_drop(e1))