Knowing the origin of a language helps us to determine the historical background of that language. As language itself is such a system of a society that is continuously evolving as that aforementioned society learns and technologically develops along with its roots or origins. Like many other languages, English is also a language that has roots or origins in many different languages. In this sense, the English language, rooted as Anglo-Saxon, is known to derive most of its words from the Latin and Greek languages by whose modern cultures, it is assumed to be affected most. In this study, this derivation of words and the intrinsic difficulties probable to occur for English as a Foreign Language learners (hereafter EFLs) with a special interest upon the case of pluralization are scrutinized. That is why it is enlightened by the author of this paper within the scope of the historical background, the etymology of the English language within a linguistic perspective. As a result, the most common and confusing plural forms of Greek-originated English words, and some curing methods are defined.