Many people have gathered to protest the government.
People gathering to protest.
Have gathered is past tense as gathering is present tense.
exists e1 p1 x1 x2.(n_government(x2) & Topic(e1,p1) & Actor(e1,x1) & v_gather(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_protest(e2)) & n_people(x1) & n_quantity(x1))
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_gather(e1) & exists e2.(Actor(e2,x2) & v_protest(e2)) & (x1 = x2) & n_people(x1))