What Are Modal Verbs for Advice, Obligation, and Prohibition?
Modal verbs are special verbs that add extra meaning to the main verb in a sentence. They show things like possibility, ability, permission, and in this lesson, advice, obligation, and prohibition.
These verbs always come before the main verb, which is usually in its base form (the infinitive without to).
- You should study. (Not You should to study.)
- He must go. (Not He must goes.)
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Мы используем should и shouldn't to give or ask for advice. They express what is a good idea or a bad idea.
- Использование should + base verb for positive advice. For example, You should get more sleep.
- Использование shouldn't + base verb for negative advice. For example, You shouldn't eat so much sugar.
Вы также можете использовать ought to вместо should. It means the same thing but is a bit more formal. For example, You ought to call your parents.
When Do We Use 'Must' and 'Have to' for Obligation?
И то, и другое must и have to express obligation, meaning something is necessary or required.
- We often use must for rules or laws that we personally agree with or feel are important. It often comes from the speaker's own feeling. For example, I must remember to send that email.
- We often use have to for rules or obligations that come from an external authority (like a school, a job, or the law). For example, We have to wear a uniform at work.
In many everyday situations, must и have to can be used similarly, especially when the obligation is clear. However, have to is more common in spoken English.
How Do We Express Prohibition with 'Mustn't'?
Мы используем mustn't (или must not) to say that something is prohibited or not allowed. It expresses a strong negative obligation.
- Например, You mustn't use your phone during the exam.
- Another way to express prohibition is with can't или are not allowed to. Например, You can't park here. или Students are not allowed to leave early.
Помните, mustn't is very strong. It means it is forbidden.
What About 'Don't Have to' for Lack of Necessity?
When something is not necessary, we use don't have to. This is very different from mustn't.
- Don't have to means you can do it if you want, but it's not required. For example, You don't have to come to the meeting if you're busy. (It's optional.)
- Needn't (или do not need to) has the same meaning as don't have to. Например, You needn't worry about it.
| Modal Verb | Значение | Пример |
|---|---|---|
| Should | Advice, recommendation | You should try this cake. |
| Shouldn't | Negative advice | You shouldn't worry so much. |
| Must | Strong obligation (often internal/speaker's feeling) | I must remember her birthday. |
| Have to | Obligation (often external rule/law) | All employees have to attend the meeting. |
| Mustn't | Prohibition, not allowed | You mustn't park here. |
| Don't have to | Lack of necessity, optional | We don't have to leave yet. |
Примеры
- You should visit the museum; it's fantastic!
- She shouldn't work so many hours without a break.
- What should I do if I lose my passport?
- All passengers must show their boarding pass.
- I have to finish this report by Friday.
- You mustn't touch the exhibits in the gallery.
- We don't have to pay for parking on Sundays.
- He needn't bring a gift to the party.
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Люди, говорящие по-испански, иногда путают mustn't с don't have to because in Spanish, a single verb form might cover both ideas of 'not allowed' and 'not necessary'.
- Неправильно: You mustn't work tomorrow. (If you mean 'it's not necessary to work')
- Правильно: You don't have to work tomorrow. (It's not necessary.)
- Правильно: You mustn't work here without permission. (It's forbidden.)
Another common error is using must for advice instead of should.
- Неправильно: You must try that new coffee shop. (If it's just a suggestion)
- Правильно: You should try that new coffee shop. (It's good advice.)
Часто задаваемые вопросы
What is the main difference between 'must' and 'have to'?
While both express obligation, must often comes from the speaker's personal feeling or a strong internal conviction, like I must call my mum. Have to usually refers to external rules or obligations imposed by others, such as I have to work on Saturday.
Can I use 'ought to' instead of 'should'?
Да, можно. Ought to has the same meaning as should for giving advice. It is slightly more formal and less common in everyday spoken English, but it is perfectly correct. For example, You ought to apologize.
How do I express 'not necessary' in the past?
To express lack of necessity in the past, you use didn't have to. Например, We didn't have to wear uniforms at our old school. You cannot use mustn't in the past tense for prohibition; instead, you would use weren't allowed to, как в We weren't allowed to use phones in class.
Why is understanding these modals important for the B1 Preliminary exam?
For the B1 Preliminary exam, you need to show you can express advice, obligation, and prohibition clearly. For example, in the Writing Part 2 (email or article), you might need to give advice to a friend or explain rules. In the Speaking Part 2 (long turn), you might describe a situation and suggest what someone should или must do. Correct use of these modals helps you achieve a higher score.
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