1.(9,5) means column () and row (); The fourth column in the third row is represented by a number pair ().

2. Operate according to the requirements of the grid diagram.

(1) The positions of the four vertices A, B, C and D of the trapezoid in the graph are represented by number pairs.

(2) If the trapezoid is translated five squares to the right, and then three squares are translated down, the positions of the four vertices of the trapezoid after translation are represented by number pairs.

(3) Rotate the trapezoid clockwise by 90 degrees around point C, and rotate it again in the same way to draw the figures after the first and second rotations respectively.