Verbs are the "engines" of a sentence. Without them, you don't have a thought; you just have a list of things. They describe actions, occurrences, or states of being.
Here is a breakdown of how they function in English grammar.
1. The Core Types of Verbs
Understanding which "job" a verb is doing helps you structure your sentences correctly.
Action Verbs: Express physical or mental activity.
Physical: Run, eat, shout.
Mental: Guess, believe, wonder.
Stative Verbs: Describe a state or condition rather than an action. These usually don't use the "-ing" form.
Examples: Love, hate, seem, know, belong.
Linking Verbs: Connect the subject to a word that describes it (a "subject complement").
Common ones: Be (am, is, are, was), become, feel, appear.
Example: "The soup smells delicious." (The soup isn't performing the action of smelling; it just possesses that quality.)
Auxiliary (Helping) Verbs: Used alongside a main verb to express tense, mood, or voice.
Primary: Be, do, have.
Modals: Can, could, shall, should, will, would, may, might, must.
2. Verb Tense: The Timeline
Tense tells us when the action happened. In English, we use three timeframes, each with four "aspects."

Aspect	Simple	Continuous (Progressive)	Perfect	Perfect Continuous
Past	I walked.	I was walking.	I had walked.	I had been walking.
Present	I walk.	I am walking.	I have walked.	I have been walking.
Future	I will walk.	I will be walking.	I will have walked.	I will have been walking.

3. The Concept of "Voice"
Voice determines the relationship between the action and the subject.
Active Voice: The subject performs the action.
Example: "The chef prepared the meal." (Direct and strong.)
Passive Voice: The subject receives the action.
Example: "The meal was prepared by the chef." (Useful when the actor is unknown or less important.)
4. Subject-Verb Agreement
This is the "Golden Rule" of grammar: The verb must match the number of the subject.
Singular Subject: The dog barks.
Plural Subject: The dogs bark.
Note: A common pitfall occurs with collective nouns (like "team" or "family"). In American English, these are usually treated as singular: "The team is winning."
5. Transitivity: Who gets the action?
Transitive Verbs: Require a direct object to complete the thought.
Example: "She sent [a letter]." (You can't just say "She sent.")
Intransitive Verbs: Do not require an object.
Example: "He laughed." or "The sun set."
Verbs can get pretty complex once you dive into things like Gerunds (verbs acting like nouns) or Conditionals (the "if" sentences).