Also called personal pronouns, Spanish subject pronouns tell you who is doing the action of a sentence.

They are especially important in Spanish because the conjugation of verbs changes depending on the subject.

In English, subject pronouns are words such as "you", "we" and "it".

Spanish, however, is slightly more complicated because it uses gender and formality. For example "you" can translate as tú (informal) and usted (formal), and "we" can translate as nosotros (masculine and neutral) and nosotras (feminine).

Simplifying it somewhat though, Spanish has no subject pronoun for "it", which is generally implied in the sentence.

In fact, subject pronouns in general are often implied by the verb form and can be dropped from the sentence. For instance, instead of saying tú eres amable (you are friendly), you can simply eres amable, as eres implies tú.