A singer is crowd surfing.
The singer fell off stange onto the ground
Both sentences are talking about a singer. The first says the singer is crowd surfing. The second says the singer fell off stage onto the floor.
exists p1 x1.(exists x2 x3.((x1 = x2) & n_surfing(x2) & of(x2,x3) & n_crowd(x3)) & n_singer(x1))
exists e1 s1 s2 x1 x2.(n_ground(x2) & n_singer(x1) & onto(e1,x2) & a_stange(s2) & Manner(e1,s2) & a_off(s1) & Manner(e1,s1) & Actor(e1,x1) & v_fall(e1))