A man casually sits on a chair and talks on the cellphone as there is a bus in the background.
A man is waiting outside.
If someone sits you can say someone is waiting outside
exists e1 p1 s1 x1 x2 x3 x4 x5 x8.(n_background(x8) & n_cellphone(x5) & a_casually(s1) & Manner(e1,s1) & exists p2 x6 x7.((x6 = x7) & in(x7,x8) & n_bus(x7)) & as(e1,p1) & on(e1,x2) & subset_of(x4,x2) & on(x4,x5) & n_talk(x4) & subset_of(x3,x2) & n_chair(x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 s1 x1.(a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_wait(e1) & n_man(x1))