君たちは学校で何を学びますか。

(used colloquially by young females) you (plural); all of you; you all

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

school

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

what; how many; you-know-what; that; whatsit; what's the expression; what do you call them; what?; hey!

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to study (in depth); to learn; to take lessons in

indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way