The incorrect phrases are:
El chico alta.Unos muchachas cómico.What are the phrasesThe reason for the incorrect forms is the disagreement between the gender of articles (el, unos) and the nouns they modify (chico, muchachas), as well as the differences that exist between the gender of the adjectives (alta, cómico) and the nouns they qualify.
The right phrase is "El chico alto. " Since "chico" is a masculine noun in Spanish, the corresponding adjective must also be in the masculine form, which is "alto" (denoting "tall").
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