source: Englishing       2018年1月21日
What it is now considered “slang” may or may not be slang in 50 years time. This is the reason, Marc has decided in having this lesson. The most important thing about this lesson is to remember that this is just SLANG and thus INCORRECT English as yet.
This lesson is designed for intermediate students who wish to improve their English grammar, and for those above levels who wish to clear up doubts about this topic.