早(zǎo)上(shàng)=early morning  ——早安good morning 早飯breakfast
上(shàng)午(wǔ )=forenoon; morning ——上午好 good morning
中(zhōng)午(wǔ)=noon ——午安good afternoon 午飯lunch
下(xià)午(wǔ )=afternoon ——下午好 good afternoon
晚(wǎn)上(shàng)= night—— 晚安 good night 晚飯 dinner
半(bàn)夜(yè)=midnight—— 睡觉sleep