Distinguishing between adverbs and other parts of speech
Traditional grammars of English classify all words in eight different groups which they call "parts of speech": articles, nouns, pronouns, adjectives, verbs, adverbs, prepositions and conjunctions. This does not mean, however, that one word can belong only to one of these groups. Quite on the contrary, many words belong to several groups. For instance, the word "back" can be a noun, a verb, an adjective or adverb: - He stood with his back to the door. ( back denotes a body part, noun) - Her parents backed her in her choice of career. (back denotes the action of supporting somebody, verb) - We were sitting in the back row. (back modifies the row, adjective) - Sit back and relax. (back denotes the direction of movement, adverb) Why does this happen? The answer lies in the simple fact that words cannot be defined on their own but only through their interaction with other words in a phrase, clause or sentence. So you cannot learn that "by", ...