Off and Of (Grammar Lesson)

What is the difference between off and of?

Off is the opposite of on. It is pronounced "OFF."

Of is most commonly used to show possession (e.g., an uncle of Mr. Jones) or to show what something is made of (e.g., a wall of ice). It is pronounced "OV."

What Is the Difference between Off and Of?

Writers are sometimes confused by the words of and off. As this confusion rarely occurs in speech, it can often be rectified simply by remembering how the words are pronounced. The words of and off are both prepositions. (Note: Here at Grammar Monster, we have found that explaining the grammatical functions of these words is not usually helpful because anyone who can understand the explanation rarely confuses the words.)

Using Of

Here are the most common uses of the word of. The word of is used:

Using Off

The word off is the opposite of the word on. For example: The word off is commonly seen as part of a phrasal verb, which is a single verb made up of more than one word. A phrasal verb has a main verb and an accompanying word (like off). The accompanying word can be either a preposition or a particle (a type of adverb).

When the accompanying word introduces a prepositional phrase, it is classified as a preposition. When it does not, it is a particle. For example (phrasal verbs shaded):

Don't Write Get Off Of

With verbs like to get off, to live off, and to go off, there is no need to add of. With these verbs (called phrasal verbs), the off acts as a preposition. There is no need to add your own preposition (i.e., don't write off of). For example:

A Quick Test

How Many Fs Are There?

How many times does the letter F appear in the bold text below?


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See Also

What is a preposition? What is a prepositional phrase? What is a phrasal verb? List of easily confused words