A man talking on his cellphone on the street.
A man texting on his mobile while walking down the street.
He would either be talking or texting with his phone, not both at once.
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & on(e1,x3) & on(x3,x4) & n_cellphone(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_man(x1))
exists e2 e1 s1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & while(e1,e2) & a_down(s1) & Manner(e2,s1) & Theme(e2,x4) & Actor(e2,x2) & v_walk(e2) & on(e1,x3) & n_mobile(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x2) & v_text(e1) & (x1 = x2) & n_man(x1))