have to/must/should

when we were at school, we had to/must wear uniforms.

You mustn't/don't have to come to work dressed in jeans. you have to look smart.

I think you have to/should think about whether you really want to apply for the job.

The doctor told me that I should/must do more exercise.

You don't have to/mustn't send the forms in until September, but it's a good idea to send them early.

I love Saturday mornings, because I don't have to/mustn't get up for work.

It's a good job but we have to/should work hard.

I really must/should give up smoking. It's not good for me.

Francois is very lucky. His father is very rich, so he mustn't/doesn't have to work at all.