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Modal Verbs (Could (Could is the past tense of can. It is used to talk…
Modal Verbs
Could
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Note that could doesn’t always refer to past time. It refers to past time only when the context makes the time clear.
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He said, ‘ I can lift this box.’
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She said, ‘I can’t see anything.’
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May
"May" is a modal verb most commonly used to express possibility. It can also be used to give or request permission, although this usage is becoming less common.
Have to
In general, have to expresses impersonal obligation. The subject of have to is obliged or forced to act by a separate, external power (for example, the Law or school rules). Have to is objective. Look at these examples:
In France, you have to drive on the right.
In England, most schoolchildren have to wear a uniform.
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In each of the above cases, the obligation is not the subject's opinion or idea. The obligation comes from outside.