A suffix may belong to one grammatical class in the case of some words but it may have to be classified differently in the case of some other words. In words like brotherly, friendly and scholarly, -ly is an adjective suffix having a denominal function but in words like foolishly and wisely, it operates like an adverb suffix having a de-adjectival function. In view of these principles of classification, suffixes in English can be discussed in terms of the following types and subtypes.