Grammar Challenge - Must / mustn't | Текст песни

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• Must / mustn't

http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/1435_gramchallenge19/
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Nuala's Grammar Explanation: Must/mustn't:

To talk about things you're obliged and not obliged to do, we can use 'must' or
'mustn't'. Listen again:
Jo: You must curtsey or bow
Elena: You must address her as "Ma'am"
To talk about rules and things you're not allowed to do, things that you're obliged
not to do. you can use 'must not' or 'mustn't'
Diarmuid: You mustn't look directly at the Queen.
Elena: You mustn't call her "Elizabeth."
When we use must or mustn't we're talking about obligation and this obligation can
come from ourselves:
"I haven't been to the dentist for ages. I must go soon, "
or from someone else: a school, a government or your boss;
"You mustn't take things from the office without permission."
In the positive, you use 'must' followed by the base form of the main verb, that's the
infinitive without 'to'. Must is a modal auxiliary. Its form doesn't change whether
you're talking about you, I, she. You must, I must, she must etc.
In the negative, you use 'must not' followed by the base form of the main verb. In
spoken English, we usually use contractions. So we say 'mustn't' rather than 'must
not. Listen again:
Diarmuid: You mustn't look directly at the Queen.
Elena: You mustn't call her "Elizabeth."
So, when you want to talk about rules or things you have no choice about, you use
'must' or 'mustn't' followed by the base form:
You must curtsey or bow.
You mustn't call her "Elizabeth"
That's all from me, good luck with your grammar challenge!
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