ought to, may
Ought to betyder borde. (Ought to och should betyder i princip samma sak.)
Ex. 1: You ought to have brought an umbrella since you knew it was going to rain.
Ex. 2: You have talked a lot already so you ought to stay quiet now.
May betyder få (eller få lov att) och används när man pratar om att få eller ha tillstånd.
Ex. 1: May I have another one of your cookies? They are delicious.
Ex. 2: Visitors may not feed the animals in the zoo.