'Cause is a shortened spoken form of because. Note the apostrophe. Writing "cause" in place of "because" is simply wrong. "Cause" has its own meaning. Using slangy forms such as "cos", "coz" or "cuz" is also poor writing.

Cause=Slang, short word for because, no proper :)

Not a problem, ordinary speech and the written word in English can be very different. However a lot of people are now writing things as they are spoken. Some resumes are now being written in the abbreviated form used for SMS .. not successfully however. You definitely don't have to apologize for making a mistake while writing in a foreign language.

Michael, I expressed myself wrong. I'm sorry. I was understanding that because and cause's wanted to say the same thing, however, understood that not. Thank you anyway

"Causes" is a word. "Cancer has many causes" Because just means porque Sometimes in "every day" English you will see people say "cause," which means because, they din't pronounce the "b"