As shown in Figure A, in the cube ABCD-A'B'C'D', E and F are the midpoint of AA' and C'D' respectively, and G is the center of the square BCC'B', then the projection of quadrilateral AGFE on all sides of the cube may be (1), (2) and (3) in Figure B.

Both the upper and lower surfaces are (1).

Yes on the left and right (2)

The front and back are (3)

Projection draws a point that is not on the plane perpendicular to the plane, and the vertical foot is the projection of the point.

Draw a vertical line at the end of the line that is not in the plane, and the vertical line connected with the vertical foot is the projection of the line.

Draw a vertical line at the vertex of the plane that is not in the plane, and the vertical line connected with the vertical foot is the projection of the plane.

I wish you progress in your study.