Breakdown of Weißt du, ob die Vergangenheit deiner Familie ein Geheimnis ist?
sein
to be
ein
a, an (eine)
du
you (informal singular)
die Familie
the family
dein
your (informal)
wissen
to know (a fact)
das Geheimnis
the secret
ob
whether / if
der
who, which, that (relative pronoun; die, das)
die Vergangenheit
the past
Questions & Answers about Weißt du, ob die Vergangenheit deiner Familie ein Geheimnis ist?
Why use ob for "if" instead of wenn?
In German, ob means "if" in the sense of "whether." You use it when expressing uncertainty, reporting indirect questions, or asking a yes/no question. Wenn is used for conditions ("If it rains..."). Since you are basically asking "Do you know whether the past is a secret?", you must use ob.
Why is the verb ist at the very end of the sentence?
The word ob introduces a subordinate (dependent) clause. Connecting words like ob, weil (because), and dass (that) act as "verb kickers"—they always send the conjugated verb (in this case, ist) to the very end of their clause.
Why is it deiner Familie instead of deine Familie?
This uses the Genitive case, which shows ownership or possession (like adding "'s" or "of" in English). Because Familie is a feminine noun, the possessive word deine (your) changes to deiner to mean "of your." The phrase literally means "the past of your family."
Why is it ein Geheimnis and not einen Geheimnis?
The verb sein (here conjugated as ist) is a linking verb. It acts like an equals sign between the subject (die Vergangenheit) and what it is (ein Geheimnis). Linking verbs always use the basic Nominative case for both sides, never the Accusative. Since Geheimnis is a neuter noun, it remains ein.
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