A couple listening to performers on the street.
A couple scream about taxes while at the library.
Listening to performers isn't the same as scream about taxes. They are in the street, not the library.
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & to(e1,x3) & on(x3,x4) & n_performer(x3) & Actor(e1,x2) & v_listen(e1) & (x1 = x2) & n_couple(x1))
exists e1 x1 x2 x3.(n_library(x3) & at(e1,x3) & r_while(e1) & about(e1,x2) & n_tax(x2) & Actor(e1,x1) & v_scream(e1) & n_couple(x1))