1, first open Ps, then press CTRL+O to open a picture, then press ctrl+J to create a layer, and then double-click the background layer to unlock it.

2. Then, in the left toolbar, use the rectangular box selection tool to box out the place where the page needs to be turned in the lower right corner.

3. Then select the gradient tool in the toolbar on the left, then hold down the mouse to pull a line in the selection from the upper left corner to the lower right corner, and then press CTRL+D to cancel the selection.

4. Click Edit → Free Transform in the menu bar, click the mark in the toolbar above, and nine boxes will appear.

5. Then select the anchor point in the lower right corner, drag it to the appropriate position to the upper left, as shown below, and press enter to confirm.

6. Right-click the background layer, select the blending option → Shadow, and adjust the distance parameter.