Our language includes words that were created to confuse writers.
High school English teacher Sue Sommer authored The Bugaboo Review for her students. Filled with common pitfalls of the English language, the confusing words and grammar issues that people continually stumble over.
In my case, I trip on the words passed and past. According to page 141 of Sommer's book:
passed - the past tense of the verb to pass
past - an adjective that means "belonging to a former time" or "beyond a time or place." Past can act as a noun or preposition too.
Triple check whether your writing strikes the right chord.
Or editors will PASS.
For more uses of the words passed and past go to - http://www.dailywritingtips.com/passed-vs-pas