English, as we know, comprises eight parts of speech and each part has a definite role to play. These parts consist of words which are particular to that category, though some words can be found in more than one category. Some of the words that fall in one part can be used to form words in other parts by suitable modification by adding a suffix or a prefix. Words are used to form sentences which are the basic units of communication. Grammar is the rule book that guides all of us to use the words in a particular way so that all of us can understand what is being communicated. One of the important parts of speech is the preposition.
The preposition is used to relate the noun to other words in a sentence. By definition a preposition is a word that is positioned before a noun and, although it is true most of the time, there are occasions where the word may come after a noun. Look at the following three sentences: