Answer:
Mi amiga Rosa es inteligente.
Mi compañera de cuarto es perezosa.
María, tú eres muy simpática.
Pablo, tú eres muy divertido.
Me llamo Luis y soy mexicano.
Mi profesora de matemáticas es muy trabajadora.
Mi hermana puede ser muy impaciente y un poco difícil.
Angélica y Miguel son serios.
David y Martín son muy trabajadores.
Gabriel es popular. Leticia es muy popular también.
Explanation:
In Spanish adjectives have genre, and they can be singular or plural. In general, <u>when an adjective is female, it ends with an "a"</u>, as in "peresoza" or "trabajadora". <u>When it's male, it ends with an "o</u>", as in "divertido" or "mexicano" (note that in Spanish nationalities aren't written with capital letters). When adjectives accompany a plural noun, they need to be in the plural form. In this case, an "s" should be added at the end of the adjective. For example, "serios".
There are, however, <u>some exceptions when it comes to adjective's genre</u>. For instance, <u>when they end with an "</u>e", they remain the same both for male and female nouns. This is the case of "inteligente". <u>When the adjective ends with "ar", as in "popular", they also remain the same</u>.
<u>Finally, when there is a male and female noun together which need a plural adjective, the form used is the male one. </u>For example: "Angelica y Miguel son muy trabajadores". In this case "trabajadores" is male, but it's correct.