He's a great stand-up comedian. It's essential that we book tickets. - We must/have to/need to book., No, it's not essential to get tickets before we go. - We don't have to/don’t need to/needn’t get., You're not allowed to turn up without a ticket. - You can’t/mustn’t turn up., I think the best thing for you to do is to phone and find out. - I think you should/ought to phone., They say it’s too late to buy them now, so why didn’t you buy them before? ​ - You should have/ought to have bought them,

can, should, must, need (to), have to, or ought to

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