1. every day名词短语（也有不少人说是副词性短语），可用作状语。表示“每天”，一般放在句首或句末，用来修饰整个句子。如：
We're open from 8 to 7 every day.
我们每天从早8点至晚7点营业。
I go swimming every day in order to keep fit.
我每天游泳以保持健康。
It is important that he should attend every day.
他每天都要出席，这很重要。
She does an hour's piano practice every day.
她每天练一小时钢琴。
They walk their dogs every day.
他们每天遛狗。
I bathe every day.
我每天洗澡。
He SMSed me every day.
他每天给我发短信。
Aspiring musicians need hours of practice every day.
想当音乐家就要每天练许多小时。
Someone comes in every day to check all is in order.
每天都有人来检查是否一切都井然有序。
Frances took her daughter walking every day, rain or shine.
弗朗西丝无论晴天还是下雨，每天都带女儿去散步。
You should wash your feet and your privates every day.
应该每天洗脚，并清洗阴部。
2. everyday 是形容词，“每天的;日常的”，可用作定语：
In the course of my everyday life, I had very little contact with teenagers.
在我的日常生活中，我很少和青少年打交道。
The Internet has become part of everyday life .
互联网已成为日常生活的一部分。
These changes were gradually assimilated into everyday life.
这些改变逐渐渗进了日常生活。
assimilate [əˈsɪməleɪt]
v.(使)同化;吸收;消化;透彻理解;使吸收，使接受(想法、态度等)
The police are used to this kind of everyday incident.
警察们已经习惯了这种日常的事件。
Her novels are anchored in everyday experience.
她的小说取材自日常生活经验。
She longed for something to relieve the tedium of everyday life.
她渴望有什么事情能排解她日常生活中的烦闷。
Many of the differences in everyday life remain
日常生活中的许多差异仍然存在。
One in five young adults was struggling with everyday mathematics.
1/5的年轻人做日常的数学计算都费劲。
The film chronicles the everyday doings of a group of London schoolchildren.
电影记载了一群伦敦小学生的日常活动。
chronicle [ˈkrɑːnɪkl]
n.编年史;历史
vt.把…载入编年史;按事件发生顺序记载
The series chronicles the everyday adventures of two eternal bachelors.
这个系列剧按照时间顺序记述了两个老光棍每天（日常）的奇遇。
《柯林斯高阶英汉双解学习词典》
adventure [ədˈventʃər]
n.冒险;冒险经历;奇遇;冒险的刺激;大胆开拓
v.探险;冒险;大胆说出
eternal [ɪˈtɜːrnl]
adj.
不朽的;永久的;永恒的;无休止的;永不停止的;没完没了的
n.永恒的事物;Eternal 上帝;与定冠词the 连用
bachelor [ˈbætʃələr]
n.单身汉;学士;未婚男子
This invariably wins them the love and respect of others, for they add colour to the dull routine of everyday life.
这做法总是使他们赢得别人的爱戴和尊敬，因为他们给单调的日常生活增添了色彩。（新概念英语三L31）
invariably [ɪnˈveriəbli]
adv.一成不变;始终如一地;一贯地
routine [ruːˈtiːn]
n.常规;正常顺序;生活乏味;无聊;(演出中的)一套动作，一系列笑话(等);例行程序
adj.常规的;例行公事的;日常的;平常的;正常的;毫不特别的;乏味的;平淡的
最后这个例句最能体现这两个词的用法规则：
It is necessary for us to learn some everyday English every day.
我们每天学习点日常英语是必要的。