Question

You___drive carefully on the highway. (use modal verb)
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Answer 1

Answer:

must

Explanation:

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Answer 2

You should drive carefully on the highway.

Modal Auxiliary-

• A modal auxiliary is a word or group of words that are used as a helping verb along with the main verb to convey some meaning and type of the sentence.
• The common examples of modal auxiliaries are should, would, could, may, will, can, might, etc.
• Each of these modal auxiliary depicts and expresses different situations when used in a sentence.
• For instance, if I want to express and show someone's ability I will use the modal auxiliary verb 'can' in the sentence.
• As 'can' expresses and shows the abilities of any given person.
• For the given question the auxiliary verb 'should' is used as it expresses and indicates a duty and obligation.
• The modal verb 'must' could also be in place of 'should' but then that modal verb indicates more of an order.

As there is an obligation to drive carefully is made, the modal verb "should" is used.

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