Health. Must, mustn't, should, shouldn't. (Nesvit, p.65-67)

To be healthy you ... keep your body clean.

I ... clean my teeth twice a day.

I'm ill. I ... stay in bed.

I think I have caugh a cold. - You ... stay in bed.

You're some plump. I think you ... do sports.

Your cat is too fat. You ... feed it too much.

You ... put on your jacket. It's cold today.

You ... smoke!

... I drink warm tea with honey?

We ... keep our home clean.

It won't be rainy today. You ... take your umbrella with.

You ... swim there. There are the sharks in this lagoon.