Wordse baser surMeaningto base oneself onPart of speechverbPronunciationCourseFrenchLessonIndefinite relative pronouns (ce à quoi, ce sur quoi)Usages of se baser surJe voudrais savoir ce sur quoi se base la théorie.I would like to know what the theory is based on.Il faut que tu regardes ce sur quoi se base le film.You must look at what the movie is based on.