パイをもう一ついかがですか。

Japanese babylon (species of shelled mollusk, Babylonia japonica); Japanese ivory shell; spinning top (traditionally made from a Japanese babylon shell)

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.

now; soon; shortly; before long; presently; already; yet; by now; (not) anymore; further; more; again; another; the other; interjection used to strengthen expression of an emotion (often exasperation)

one; for one thing; only; (not) even; just (e.g. "just try it")

how; in what way; how about

be; is

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