Breakdown of Il faut que tu regardes ce sur quoi se base le film.
tu
you (informal singular)
regarder
to watch
le film
the movie / the film
il
it (impersonal subject)
falloir
to be necessary / must (impersonal)
que
that (introducing a clause)
ce sur quoi
what ... on
se baser sur
to base oneself on
Questions & Answers about Il faut que tu regardes ce sur quoi se base le film.
Why do we use ce sur quoi to mean "what... on"?
In English, we often put the preposition at the end of the sentence ("what the movie is based on"). In French, the preposition must come before the relative pronoun. The verb phrase here is se baser sur (to be based on). Because "what" doesn't refer to a specific noun already mentioned, we use the indefinite ce ("the thing") followed by the preposition sur, and then quoi ("which"). Literally, it translates to "the thing upon which".
Could I just say tu regardes sur quoi se base le film without ce?
No, you need ce here. In French, relative pronouns usually need an antecedent (a noun they refer back to). When there isn't a specific noun—like when we say "what" in English to mean "the thing that"—French uses ce as a dummy pronoun to attach the preposition and quoi to.
Why is the word order se base le film instead of le film se base?
It is a stylistic inversion. After relative pronouns like quoi, que, or où, if the subject is a full noun (like le film) rather than a pronoun (like il), French speakers often flip the subject and verb. Saying ...ce sur quoi le film se base is also grammatically correct, but the inverted version flows better and is very common in written and spoken French.
Is tu regardes in the subjunctive here?
Yes, it is! The phrase Il faut que ("It is necessary that" / "You must") always triggers the subjunctive mood. For a regular -er verb like regarder, the tu form of the subjunctive (tu regardes) happens to look and sound exactly like the normal present tense, but grammatically it is acting as the subjunctive here.
Why is the verb reflexive (se base) instead of just est basé?
While you can sometimes use the passive voice (est basé), French frequently prefers to use a reflexive verb to express the same idea. So, instead of saying the movie "is based" on something, French naturally says that the movie "bases itself" on something (le film se base sur).
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