Boy in striped t-shirt walking along a ledge.
A boy swimming in a lake.
Walking and swimming are different verbs.
exists s1 s2 s3 x1 x2.(ne_nam_boy(s1) & a_topic(s1) & in(s1,x1) & along(x1,x2) & n_ledge(x2) & n_walking(x1) & a_t-shirt(s3) & Theme(s3,x1) & a_striped(s2) & Theme(s2,x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_lake(x3) & n_swimming(x1) & of(x1,x2) & n_boy(x2))