zakresl wlqsciwa forme. 1.you *shouldn't/mustn't* ride a motorbike without a helmet. 2. I think you *should/must* stay indoors. It's raining. 3. You *should/must* be 17 to drive a car in the UK. 4.You *shouldn't/mustn't* watch TV until you have finished your homework. 5. I think we *should/must*go swimming. It's lovely weather.