A: I can't see that sign very well. B: You .. see an optician. A: I feel tired. B: You go to bed so late. A: B: c) expressing obligation Do I have to wash the dishes? Yes, you do! You ...... wash the dishes - it's your turn! e) expressing prohibition A: Can I park here? B: No, you can't. You park here - it's illegal. A: B: E​