--instructions--

This task doesn't have audio. Read the question below and select the correct answer.

--questions--

--text--

Which sentence is grammatically correct?

--answers--

Everyone must to follow the security guidelines.

--feedback--

Must is followed by the base verb without to.

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Everyone must following the security guidelines.

--feedback--

Must should be followed by the base verb, not the -ing form.

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Everyone must followed the security guidelines.

--feedback--

Must is followed by the base verb, not the past tense form.

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Everyone must follow the security guidelines.

--video-solution--

4

--explanation--

Modal verb is always followed by the base form of the verb. Modal verb does not take to, -ing, or past tense forms. Here are examples of the incorrect verb forms:

• Must to follow is incorrect because must takes to.

• Must following is incorrect because must is followed by an -ing form.

• Must followed is incorrect because followed is in the past tense.