Pergunta feita por uma aluna no cursinho (que é uma dúvida constante dos alunos)
Question made by a student (common doubt among them)

Every day X Everyday

In short, “everyday” is an adjective which describes something ordinary or commonplace, while the phrase “every day” means “each day.” Confusing these two is a very common grammatical error, and learning to catch this error can improve the quality of your writing immensely.


http://www.wisegeek.com/what-is-the-difference-between-everyday-and-every-day.htm

Every day X Everyday X Daily

por Lígianlf » Sáb Ago 30, 2008 12:07 pm

Hello, muitos estudantes confundem o uso de Every day, Everyday, Daily.

Every day:significa todos os dias, cada dia separadamente.
Ex.: He works every day. (Ele trabalha todos os dias.)

Everyday:significa diário, cotidiano, comum, habitual.
Ex.: Accidents are an everyday occurrence on this road. (Acidentes são uma ocorrência comum nesta estrada.)

Daily:significa diariamente, diário, dia a dia.
Ex.: The daily newspaper is here. (O jornal diário está aqui.)

see you

(retirado de: http://www.englishexperts.com.br/forum/every-day-x-everyday-x-daily-t1251.html)