Duolingo Grammar: 1.3 Conjugations of the verb sein.

B. Home.
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Conjugations of the verb sein (to be)

Like in English, sein (to be) is completely irregular, and its conjugations simply need to be memorized. Again, you will learn the plural forms soon.

English	German
I am	ich bin
you (singular informal) are	du bist
he/she/it is	er/sie/es ist