Which is the short form of el gato suyo?

a. tu gato
b. mi gato
c. su gato***
d. vuestro gato

Good choice! "suyo" is a possessive adjective (LONG FORM, which substitutes for the SHORT FORM "su." The subject must be 3rd person, either singular or plural = Ud., Uds., él, ellos, ella, ellas.

The subject of a is tú, of b is yo and of vuestro, vosotros/vosotras.

Sra

The short form of "el gato suyo" is "su gato." The phrase "el gato suyo" means "his/her/its cat" in Spanish. To determine the short form, you should identify the possessive pronoun that matches the context of the sentence. In this case, "suyo" indicates possession by a third-person singular subject (his/her/its). Therefore, the correct answer is option c. "su gato."