The verb sein changes form with its subject: ich bin, du bist, er/sie/es ist, and wir/sie/Sie sind. A finite form of sein is required when it links the subject to a description or location.
ich bin · du bist · er/sie/es ist · wir/sie/Sie sind
See it in a sentence
Ich bin bereit.
I am ready.
"Bin" means "am" in this sentence.
Wir sind zu Hause.
We are at home.
"Sind" means "are" with "wir" ("we").
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