A preposition is word used make position prior to other words(like noun, pronoun, or phrases).
Structurally prepositions are:
  1. Simple Prepositions
  2. Double Prepositions
  3. Compound Prepositions
  4. Participle Prepositions
  5. Phrase Prepositions
Functionally prepositions are:
  1. Prepositions for Place - in room, on table, at KPHB
  2. Prepositions for Time - in 2020, on Monday, at 3PM
  3. Prepositions for Direction - into room, under table
  4. Prepositions for Connection - by him, with you

1. Simple Prepositions
A simple prepositions are words like of, to, for, under, at.
2. Double Prepositions
A double prepositions is two simple prepositions used together like into, onto, upon, out of.
3. Compound Prepositions
A compound prepositions are consists of a simple preposition with other words. Examples are in the middle of, on the behalf of, at the center of.
4. Participle Prepositions
A Participle prepositions are having ending with words as -ed and -ing. Examples are during, executing.
5. Phrase Prepositions
A phrase prepositions includes a preposition with an object or object's modifier. Examples are at home, on time.

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