Can "être sur" be used as "to be about"? Examples:
- Ce livre est sur la naissance du capitalisme.
- C'est sur le vol de la plus grande banque du pays.
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Sign up to join this communityêtre sur for be about is fine. It's a bit informal, though. As LPH rightly suggests, c'est un livre sur is more common than ce livre est sur. Another way, more formal, that works well and that could be used in, say, a paper is :
But there are many other ways to express the same idea.