(1)同位角3,AB截EF、GH两条直线;同位角6,GH截AB、CD两条直线;
(2)内错角1,AB截EF、GH两条直线;内错角5,GH截AB、CD两条直线;
(3)同旁内角2,AB截EF、GH两条直线;同旁内角4,GH截AB、CD两条直线,.