A man in a white shirt is on his cellphone by the gate.
A man on his phone.
The man could be wearing a white shirt, and the phone he is using is his cellphone
exists p1 s1 x1 x2 x3 x4.(n_gate(x4) & on(x1,x3) & by(x3,x4) & n_cellphone(x3) & of(x3,x1) & n_male(x1) & in(x1,x2) & n_shirt(x2) & a_white(s1) & Theme(s1,x2) & n_man(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_phone(x2) & of(x2,x1) & n_male(x1) & n_man(x1))