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Of, About, For, With, and By Correct Usage

Of, About, For, With, and By Correct Usage

Correct usage of Prepositions: of, about, for, with, by.


Of expresses the relationship of a part of something to its whole. It is the most used preposition in English.
  • He is a boy of 15.
  • Some parts of his body were injured.
  • Most of the guests are gone.
  • The plays of Shakespeare will always be classics.


About means ‘on the subject of’ something or ‘concerning of’ something/someone. It also means ‘approximately.'
  • I was about to leave.
  • He cares about his classes.
  • I have about 30 candies in my bag.
  • This article is about computers.


For means ‘with the object or purpose of’. It indicates suiting of purpose for something/someone.
  • I will always be here for you.
  • I have done it for my benefit.
  • Cucumber is a good vegetable for making a salad.
  • Take my gratitude for your kind hospitality.


With means ‘accompanied by’ something or someone.
  • I will always be with you.
  • I have brought some candies with me.
  • He is playing with his sisters.
  • It is free with this product.


By means ‘as a means of’ something or someone. This preposition often comes in a passive sentence.
  • Do you travel by bus/train/plane/bike?
  • He was undone by me.
  • The letter was written by him.
Source: Learn Grammar

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