Today's dinner is fish.
Konban no okazu wa sakana da.
tonight; this evening
indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
accompaniment for rice dishes; side dish; food for thought (esp. in the context of conversation, or material for assisting arousal during masturbation)
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
be; is; indicates past or completed action; indicates light imperative