People gathered together in a concert.
A man checking his guitar.
People are more than one person and a man is a single person.
exists e1 p1 x1 x2.(in(e1,x2) & n_concert(x2) & exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_gather(e1) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_check(e1) & n_guitar(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))