Sentence #1 has a demonstrative adjective. Sentence #2 has both a demonstrative adjective and a demonstrative pronoun. Sentence #3 uses a regular possessive pronoun. Sentence #4 is the only sentence that uses a present progressive tense.
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Answer: In order for a sentence to be grammatically correct, the subject and verb must both be singular or plural
Explanation:
It is divertido which means funny.