Ought to is a modal verb. It has about the same meaning as should so that we can use should instead of ought to. Ought to does not change its form, for example it does not take an –s. It can be used in the negative forms such as ought not to or oughtn’t to (you ought not/oughtn’t to have done it).
- You ought to be ashamed of yourself for doing what you have done. (Expected or desirable state)
- He ought to have kept his appointment and be here by now, but there’s no sight of him. (Duty or correctness)
- Your parents ought to arrive home shortly if they are not stuck in a traffic jam. (Probability)
- If you have not done anything wrong, you ought not to be so afraid of your boss. (Negative form)
- Given his height, he ought to play basketball.
- Given his height, he should play basketball.
- You ought to be kinder to animals and insects.
- You should be kinder to animals and insects.
We use used to to show a habitual action, or something always happened or true in the past, but it no longer happens or is no longer true.
- She used to have a beautifully shaped body. (Not any more)
- When she was younger, she used to wear miniskirt.
- He used to train lions until he was badly mauled by a lioness.
- When we were children, we used to go into the woods to pick wild mushrooms. (Habitual action)