We have milk for breakfast every day.
everyday 形容词：每天的,日常的,平常的,平凡的
例：a suit for everyday wear.
适合平日里穿的衣服
*every day 通常做“每天”解作状语时,省掉介词（in),表示频率.
I go to school every day.我每天上学
He exercises every day.他每天锻炼