Verbs

Verbs are action words (e.g., to run, to eat, to learn).
In German, verbs that describe actions are known as “tun-Verben” (doing verbs) and verbs that describe a state of being are called “sein-Verben” (being verbs). 
For example, “laufen” (to run) is an action verb because it describes the action of running. On the other hand, “sein” (to be) is a being verb because it describes a state of existence or identity.

Action Verbs (tun-Verben):

• Essen (to eat) – Ich esse gerne Pizza. (I like to eat pizza.)
• Lesen (to read) – Sie liest ein Buch. (She is reading a book.)
• Spielen (to play) – Wir spielen Fußball im Park. (We are playing soccer in the park.)

Being Verbs (sein-Verben):

• Sein (to be) – Du bist mein bester Freund. (You are my best friend.)
• Werden (to become) – Er wird Arzt. (He will become a doctor.)
• Bleiben (to stay) – Sie bleibt zu Hause. (She is staying at home.)

The verbs change their form depending on the Pronoun before the verb. These are words like I, me, she, you, it, they, and us. In English we use I am hungry but he is hungry. In German all verbs change depending on the pronoun, not just the sein (is/am) Hilfsverb.
Examples of relative pronouns are: which, that, whose, whoever, whomever, who and whom, and many