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2.1.4 Modals of Obligation

There are three main verbs for obligations
which are MUST, HAVE TO and SHOULD

MUST is often used for personal obligations

whereas HAVE TO is more to general obligations.

For no obligations, modal verbs that are commonly
used are don’t have to, must not, should not and

ought to.

Examples:
1. You must stop now.

2. You have to follow the schedule.

Keep in mind that the

verb ‘must’ only exists
in the simple present
and present perfect

forms.

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