Can / Could
Can I drink some water?
Can / Could
Can I open the window?
Can / Could
Can I play mobile games?
May
May I turn on the TV?
May
May I go out?
May
May I come in?
Can / Could
Can I use your cell phone?
May
May I borrow your dictionary?
May
May I wash my hands?
May
May I sharpen the pencil?
May
May I read a comic?
May
May I go to the toilet?
May
May I borrow your pen?
Can /Could
Can I eat some bread?
Can (go) / Could
Can I go to the school yard?