じゃあ、キーをもらえますか。

then; well; so; well then; combination of 'de' and 'wa' particles; plain copula

key; long squealing sound

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 be able to receive; to be able to take; to be able to accept; could you (give me); would you; can you

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