These three boys are trying to carry some wood.
The boys have big muscles.
The first sentence says nothing about their muscles.
exists e1 p1 x1.(n_boy(x1) & card_eq_3(x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_carry(e2) & n_wood(x2)))
exists e1 s1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_muscle(x2) & a_big(s1) & Theme(s1,x2))