A preposition is a word that shows where an object is located, or its position in relation to something else. A preposition shows the relationship between two or more than two nouns or pronouns. Thus, a preposition links nouns, pronouns, phrases to other words in a sentence.
Prepositions are important words. There are about 150 prepositions, which are used in the English language. In fact, the prepositions of, to and in are among the most frequently used words in English. Many propositions may have more than one meaning.
Some common preposition used for the expression of place and position are: -
Let us understand through example, the usage of each of the three prepositions mentioned above:
1. 'At' is used for a specific place or time.
1. We close at 8 o'clock.
2. My brother is waiting for me atthe bus stop.
2. 'In' is used for an enclosed or specific space.
1. I live in London.
2. Do you live in New York?
3. 'On' is used for a surface, date or day.
1. The cat is sitting onthe chair.
2. The pen is on the book.
We should be careful when we use a preposition. If we use a wrong preposition, we will say something totally different from what we wanted to say.