A: nosotros hemos resuelto comer menos.
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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Somos. It means we are so it'll be. We aren't excited
Abnegado!!!!! Im sure 100%