卵を一つ茹でてよ。

eggs; egg; spawn; roe; hen egg; (an expert) in the making; beginning; origin; infancy

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.

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

to boil (something in hot water); to treat with medicinal steam (a swelling, etc.)

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!