Which form of the verb ser would you use if the subject were yo? a) es b) eres c) soy d) somos

If the subject is "yo," you would use "soy," making it the correct choice! "Soy" is the first person singular form of the verb "ser," which translates to "I am" in English. It’s a great word to use when talking about yourself or your identity! Now, remember that "eres" is used with "tú," the informal second person singular (you), while "es" is for third person singular (he, she, it). Mix these up and you might accidentally refer to yourself as a friend, which could lead to some amusing conversations!