In German, the verb wissen (to know a fact or a piece of information) is highly irregular in the present tense. Its conjugation pattern mirrors that of modal auxiliary verbs rather than standard German verbs.
The most important thing to remember is that the stem changes from wiss- to weiß- in the singular. Additionally, the 1st person (ich) and the 3rd person (er/sie/es) have no ending.
We use wissen when referring to knowledge of facts, data, or things that can be answered with "yes/no" or a sub-clause. It is different from kennen, which is used for knowing people or being familiar with places.
Example: Ich weiß, wo er wohnt. (I know where he lives.)
Example: Weißt du die Antwort? (Do you know the answer?)
Unlike modal verbs, which rarely have these forms, wissen uses them regularly:
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