A preposition is a simple word which may also belong to another part of speech such as an adverb, a conjunction or an adjective. 

Examples:

    • She was up until three o'clock watching the movie. (Preposition)
    • He stayed there until the rain stopped. (Conjunction)
    • She shouted at me, “Get your smelly feet off the table!” (Preposition)
    • He is sleeping like a baby as he is off today. (Adjective)

 

Same word used as preposition, adverb or conjunction

Using the preposition after:

Examples:

  • We go jogging every day after  (Preposition)
  • We got here not so long ago and she arrived after. (Adverb)
  • We arrived afterhe had left. (Conjunction)

 

Using the preposition as:

Examples:

  • She's got a job as a horse trainer. (Preposition)
  • The husband was fat, and his wife was just as (Adverb)
  • We watchedas he was flying his kite. (Conjunction)

 

Using the preposition before:

Examples:

  • He died just one day before his birthday. (Preposition)
  • She said we had met before. (Adverb)
  • Please think first before you say anything. (Conjunction)

 

Using the preposition but:

Examples:

  • He didn't tell anyone but his lawyer. (Preposition)
  • We have but one week to meet the deadline. (Adverb)
  • You are not only my best friend but also my business partner. (Conjunction)

 

Using the preposition since:

Examples:

  • We haven’t seen him since his birth. (Preposition)
  • He went to explore in that cave a year ago, and we haven’t seen him since. (Adverb)
  • I haven’t seen her since we had a quarrel. (Conjunction)

 

Same word used as preposition, adverb or adjective

Examples:

Using the preposition inside:

  • Beautiful pictures can be found inside the book. (Preposition)
  • The book has beautiful pictures inside. (Adverb)
  • The inside pages of the book have beautiful pictures. (Adjective)

Using the preposition outside:

  • There is a debt collector outside the door. (Preposition)
  • The queue for the toilets was so long, it stretched outside. (Adverb)
  • They engaged an outside consultant for the project. (Adjective)

Using the preposition past:

  • You have to drive past the hospital to reach the place. (Preposition)
  • He drove past sheep grazing in the fields. (Adverb)
  • I have been looking for my missing puppy for the past one year. (Adjective)

Using the preposition round:

  • We walked round the marketplace. (Preposition)
  • They gathered round to listen to his encounter with a wild dog. (Adverb)
  • I saw two big, round eyes which must be the owl's in that tree. (Adjective)