There is a person standing inside of a blue phone booth.
Someone is calling their mother.
Just because the person is inside the phone both, does not mean they are calling their mother. They could be calling anyone.
exists p1 x1 e1 s1 s2 x2 x3 x4 x5.((x1 = x2) & of(e1,x4) & n_booth(x4) & of(x4,x5) & n_phone(x5) & a_blue(s2) & Theme(s2,x4) & a_inside(s1) & Manner(e1,s1) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_person(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_call(e1) & n_mother(x2) & of(x2,x1) & n_thing(x1) & n_person(x1))