Subject and Predicate Finder Tool

How to use the subject and predicate finder

1. Enter your text. Type or paste a sentence or a short paragraph into the text box. The tool accepts up to 3,000 characters and analyzes each sentence on its own.
2. Run the tool. Press the Find subject and predicate button, or press Ctrl+Enter on your keyboard. You can also press Try an example to see a sample sentence.
3. Read the colors. In each sentence, blue marks the complete subject and amber marks the complete predicate. The bold underlined word is the simple subject, and the bold word with a line under it is the verb.
4. Check the four boxes. Under each sentence you will see the complete subject, complete predicate, simple subject, and simple predicate written out. Press Copy results to save them as plain text.

How the tool works

The tool works in your browser with a set of grammar rules. Nothing you type is sent to a server.

First, it splits your text into sentences. Then, for each sentence, it looks for the main verb or verb phrase, such as “jumps,” “is painting,” or “did finish.” It checks the words around each possible verb, because many English words can be either a noun or a verb.

Everything before the verb is the complete subject, and everything from the verb to the end is the complete predicate. The simple subject is the main noun or pronoun inside the complete subject, and the simple predicate is the verb or verb phrase.

The tool also has special rules for sentences that do not follow the usual order. In a question, the helping verb comes before the subject, so the predicate is split around it. In a command, the subject “you” is understood. In a sentence that begins with “there is” or “there are,” the real subject comes after the verb. An introductory phrase such as “After the storm,” is marked as a modifier of the predicate.

Because the tool uses rules and a word list instead of a full language model, it can misread very long or unusual sentences. Use it as a study aid and check the result yourself.

Frequently asked questions

What is the subject of a sentence?

The subject is the person, place, or thing that does the action or is being described. In “The tall boy kicked the ball,” the complete subject is “The tall boy” and the simple subject is “boy.”

What is the predicate of a sentence?

The predicate tells what the subject does or is. It always contains the verb. In “The tall boy kicked the ball,” the complete predicate is “kicked the ball” and the simple predicate is “kicked.”

What is the difference between a simple and a complete subject?

The simple subject is only the main noun or pronoun. The complete subject is the simple subject plus all the words that describe it. In “The little dog barked,” the simple subject is “dog” and the complete subject is “The little dog.”

What is the difference between a simple and a complete predicate?

The simple predicate is only the verb or verb phrase. The complete predicate is the verb plus everything that completes it. In “The little dog barked loudly,” the simple predicate is “barked” and the complete predicate is “barked loudly.”

Can a sentence have more than one subject or predicate?

Yes. In “Tom and Maria sang,” the compound subject is “Tom and Maria.” In “The tree fell and blocked the road,” the compound predicate is “fell and blocked the road.” The tool marks both kinds.

What is the subject of a command?

The subject of a command is “you,” even though the word is not written. In “Close the door,” the understood subject is “you” and the predicate is “Close the door.”

Is this tool always correct?

No. It uses grammar rules and a built-in word list, not a full language model. It handles statements, questions, commands, compound subjects, and introductory phrases well, but long or unusual sentences can be misread. Treat the result as a study aid and check it yourself.

Is the Subject and Predicate Finder free?

Yes. It is free to use, needs no sign-up, and runs in your web browser.