ジェーンは歌うでしょうか。

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

to sing; to sing (one's praises in a poem, etc.); to compose a poem; to recite a poem

death

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