The verb sein is the most important verb in the German language. It is irregular, meaning it doesn't follow the standard conjugation patterns. It translates to "to be" (am, is, are) in English.
Since sein is irregular, you must memorize its forms for each pronoun:
We use the verb sein in several common contexts:
To say who someone is or what something is.
Das ist ein Buch. (That is a book.)
Ich bin Lukas. (I am Lukas.)
To describe qualities like size, color, or personality.
Du bist sehr nett. (You are very kind.)
Der Apfel ist grΓΌn. (The apple is green.)
To tell someone's job or where they are from.
Wir sind Studenten. (We are students.)
Sie ist aus Berlin. (She is from Berlin.)
To say where someone or something is located.
Wo seid ihr? (Where are you?)
Das Auto ist hier. (The car is here.)
Note: Unlike English, German does not use "to be" with ages (we use haben for some idioms, but for age specifically, German does use sein: Ich bin 20 Jahre alt).
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