De quoi traite ce film ? Que créa Pierre ? I've been reading through a grammar manual that stated that the complex inversion is possible in this case. However, it seems to me, that this is hardly used in these two cases ? De quoi ce film traite-t-il ? Que Pierre créa-t-il ? Basically those two sentences are grammatically correct...but there seems to be a snag somewhere, can someone help me find it?