Here's why:
* Subject: The subject of a sentence tells us *who* or *what* is performing the action.
* Verb Tense: The verb tense tells us *when* the action happened or is happening.
Example:
* "The dog barks." Here, "dog" is the subject and "barks" is the verb in the present tense. This tells us that the dog is barking right now.
* "The dog barked." Here, "dog" is the subject and "barked" is the verb in the past tense. This tells us that the dog barked at some point in the past.
Key Points:
* The subject can be singular or plural, but this doesn't change the tense.
* The tense of the verb is chosen based on the time frame of the action (present, past, future).
In summary, the subject of a sentence indicates the performer of the action, while the verb tense indicates the time frame of the action.