every day与everyday；every one与everyone的区别

Everyday的主要意思是“日常的”、“普通的”和“每天发生的”.虽然最后一种意思跟every day差不多,但everyday是形容词,不可以修饰动词.Every day是一个表示频率的副词词组,它才可以修饰动词.举个简单的例子：
I go to school everyday.（错!Everyday是形容词,go to school是动词词组.形容词不可以修饰动词.）
I go to school every day.（对!Every day是副词词组.副词可以修饰动词.）
还有,everyday 虽然是形容词,但它只作定语,不作表语.所以,你可以说an everyday situation/issue,但你不可以说The situation/issue is everyday.（大多数形容词是既可以作定语,又可以作表语的,比如beautiful flowers/the flowers are beautiful.）
(1)everyone：everybody是代词,是“每个人；人人；大家”的意思,不指具体哪一个人,作主语时,谓语用第三人称单数形式.如：
Everyone can do it．谁都可以做此事.
Everyone is here except Tom．除汤姆外大家都到了.
(2)everyone只能指人,不能指物；every one既可指人,也可指物.如：
Every one／Everyone in our class likes playing football．我们班人人喜欢踢足球.
There is something wrong with every one of the bikes．每辆自行车都有毛病.
(3)every one可以和of连用构成短语,而everyone则不能.如：
Every one of us is getting ready for the exam．我们每个人都在为考试做准备.