You cannot reach the island by land or air; you have to go by boat.
2. We cannot see bacteria with our eyes; we have to look at them through a microscope.
3. He cannot have a new bicycle now; he has to wait till next year.
4. Old people often cannot hear very well; they have to use a hearing aid.
5. Road users cannot do what they wish; they have to follow the traffic rules.
6. She has to accept this decision; she cannot question it.
7. You cannot believe everything you hear; you have to use your own judgement.