Preposition

Preposition 

Pre means “before” and position means “state”.
Preposition shows the position of words coming before it (May be noun, pronoun, phrase, verb etc)
These are joining words. (Join different parts of a sentence)
Examples:
The glass is on the table.
In, on, under, behind, beside, at, for, of, with, to etc are Prepositions.

Kinds of Preposition

1- Simple Prepositions: Examples: In, on, under, behind, beside, near, at, for, from, of, above etc 2- Double Prepositions: Examples: Within, into, onto, upward etc 3- Compound Prepositions Through, against, in front of etc 4- Prepositions of Place: Examples: On, at, above, under, beneath, down, up etc 5- Prepositions of Time: Examples: At, about, before, after, within, since (For some fixed time e.g. morning, today, tomorrow, evening etc), for (For some time which is not fixed e.g. number of days, hours, weeks, months, years etc) etc Rules for Prepositions: 1- It is used after verb whether Principal Verb or Helping Verb. 2- If it is changed, meaning of verb are also changed e.g. come on, come in, come out, come of etc. 3- These are also used with adverbial Phrase.