I saw the sentence below:
Accessibility remains a problem in many parts of the world.
Is it a correct sentence? Because according to dictionaries, "remain" can be used only as an intransitive verb.
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Sign up to join this communityYes, this is a grammatical sentence. Here's the relevant definition from Wiktionary:
(copulative) To continue in a state of being.
The light remained red for two full minutes.
remain is equivalent to to continue to be in your sentence:
Accessibility continues to be a problem in many parts of the world.