22. Prepositions

Prepositions are words that show a relationship between a noun (or pronoun) & an another word in a sentence. 

Words: pre means before, position means placed

Thus, 'preposition' means placed or positioned before.

Features & position:

1. Preposition is always followed by an object.
2. It keeps a sentence together by expressing place, position, time or direction.
3. It is usually placed before a noun or pronoun (object).
4. It appears at the end of sentence in questions or informal communication.

Object of Preposition:

Object of Preposition is the noun or pronoun before which the preposition is placed.

Examples:

1. The cat is under the table.
2. The train will stop at the station.
3. The children are in the classroom.
4. Who are you talking to?

Here,

1. Words 'under, at, in, to' are prepositions.
2. They are placed before the objects 'table, station, classroom'.
3. As example 4 is question, the object is 'who' & 'to' is the preposition which is placed at the end.