A group of people are on a covered area talking, and some of them are wearing volunteer for parks t-shirt.
No one is talking.
If no one is talking then a group of people cannot be in a covered area talking.
exists p1 x1 x2.(exists p2 s1 x3.(on(x1,x3) & exists e1 s2 x4 x5 x6 x7 x8.(for(e1,x7) & n_t-shirt(x7) & of(x7,x8) & n_park(x8) & Theme(e1,x6) & Actor(e1,x4) & v_wear(e1) & n_volunteer(x6) & of(x4,x1) & n_some(x4) & a_,(s2) & Theme(s2,x4) & of(x4,x5) & n_talking(x5)) & that(x3,p2) & n_area(x3) & a_covered(s1) & Theme(s1,x3)) & n_thing(x1) & of(x1,x2) & n_people(x2) & n_group(x1))
-exists e1 x1.(Actor(e1,x1) & v_talk(e1) & n_one(x1))