The common grammatical mistake made by most people is writing ‘every day’ as one word. There is a difference between ‘every day’ and ‘everyday.’ It is easy to confuse one for the other when writing a sentence and mind you this is not interchangeable.

Every day simply means ‘each day.’ In this phrase every is used to describe day. On the other hand, everyday is an adjective that means casual, routine or ordinary. The following are examples on how to use these words in a sentence.

John goes to office every day except Sunday.
John’s everyday breakfast is ham sandwich and coffee.