— OK.
例：√ She can watch TV. 例： × Don't play with fire!
Don't be late!
Please sit on your chair.
Don't put your head or hands out of the window!
Don't eat or drink on the school bus!
Don't shout in the museum!
Don't take photos!
Don't draw or write on the books!
Don't climb the tree!
Don't swim in the river!
Don't walk on the grass!
You can take photos.
√ She can watch TV. 
× Don't play with fire!
