Sheet 1: Front view: the first vertical row 1 square, the second vertical row 1 square; Left view: there are 2 in the first vertical line and 2 in the second vertical line.
Second: front view: 2 in the first vertical row and 3 in the second vertical row; Left view: the first vertical line 3, the second vertical line 1.
Third: front view: 2 in the first vertical row and 3 in the second vertical row; Left view: three in the first vertical row; In the second vertical row.