What Is a Subject in Grammar?


Simple Definition:

A subject in grammar is the main noun or pronoun that performs the action in a sentence [a group of words that express a complete thought]. The subject tells us who or what the sentence is about.


  • Sarah is walking her dog.
  • They are playing soccer in the park.

Very Simple Definition:

The subject is the person, thing, or animal doing the action in a sentence.


  • The dog is barking.
  • John is eating pizza.

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