A young boy is swimming in an underground pool right next to the 3.5 ft. sign.
This boy has swam at least once.
The boy is young. Swam is past tense of swimming.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(n_sign(x4) & of(x4,x5) & n_ft.(x5) & card_eq_3.5(x4) & in(e1,x2) & r_right(s3) & to(s3,x4) & Theme(s3,x3) & a_next(s3) & (x2 = x3) & n_pool(x2) & a_underground(s2) & Theme(s2,x2) & Actor(e1,x1) & v_swim(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_boy(x1) & card_eq_1(x2) & n_time(x2) & Frequency(e1,x2) & Actor(e1,x1) & v_swim(e1))