君が勘定を払うべきではなかったんだ。

you; buddy; pal; monarch; ruler; sovereign; (one's) master

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

calculation; computation; counting; reckoning; count; bill; check; account; payment (of a bill); settlement (of an account); consideration; allowance

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 pay (e.g. money, bill); to brush off; to wipe away; to clear away; to dust off; to cut off (e.g. branches); to drive away (e.g. one's competitors); to sell off (something unneeded); to dispose of; to pay (e.g. attention); to show (e.g. respect, concern); to make (e.g. effort, sacrifice); to expend; to exert; to move out (of one's own place); to vacate; to sweep (e.g. one's legs); to knock aside; to make a sweeping stroke (in Japanese calligraphy); to reset (an abacus)

shall; should; must

be; is; indicates past or completed action; indicates light imperative

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

nonexistent; not being (there); unpossessed; unowned; not had; unique; indicates negation, inexperience, unnecessariness or impossibility; not ...; to not be...; to have not ...

yes; yeah; uh huh; negative verb ending used in informal speech (abbr. of negative verb ending "nu"); abbr. of particle "no"; abbr. of particle "ni" (used especially when it precedes the verb "naru")