to be based
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to be based on
To rest on something as a foundation, to rely on something, or to proceed from something. It is always used with the preposition 'auf' and the dative.
Die Anklage basiert auf den Aussagen mehrerer Zeugen.
The accusation is based on the statements of several witnesses.
The verb 'basieren' (to be based) is almost always used with the preposition 'auf' and the dative. The structure is: something (nominative) is based on something (dative).
Der Film basiert auf einem Roman.
The film is based on a novel.
'Basieren' (to be based) is related to the noun 'die Basis' (the basis). If something is based on something, that thing is the conceptual foundation or starting point.
Seine Theorie basiert auf einer einfachen Annahme.
His theory is based on a simple assumption.
Common foundations on which something can be based are abstract concepts such as facts, data, an assumption, a theory, or a true story.
Die Studie basiert auf Daten von über 10.000 Teilnehmern.
The study is based on data from over 10,000 participants.
to found / be based on
Sich gründen auf and basieren auf both express that something has a particular basis. The key difference is sentence structure: gründen is used reflexively here with sich, whereas basieren is used without a reflexive pronoun. After both verbs, auf is followed by the dative.
Die Theorie basiert auf mehreren genauen Beobachtungen.
The theory is based on several precise observations.
Die Theorie gründet sich auf mehrere genaue Beobachtungen.
The theory is based on several precise observations.
