Subject–Verb Agreement

What is subject–verb agreement?

In a sentence, the verb has to agree with its subject — that is, it has to match whether the subject is one thing or more than one. When the subject is singular (just one), the verb usually adds an -s: The dog runs. When the subject is plural (more than one), the verb drops the -s: The dogs run. Getting this match right is one of the biggest steps toward clear, correct writing.

How to use this tool

• Show me — tap Singular or Plural and the subject and verb change together. The little pictures show one vs. more than one, and the verb ending that changes is highlighted.
• Hear it — replay the sentence any time; use Next subject or Shuffle to move through the examples.
• Your turn — read a sentence with a missing verb, then tap the form that agrees with the subject. Correct answers turn green and the sentence is read aloud; a gentle nudge lets you try again.
• Mute — turn the voice on or off. The tool is completely clear with the sound off.

The tricky pronouns

Most singular subjects add -s, but the words I, you, we, and they do not: we say I read and you help, not “I reads” or “you helps.” Only he, she, and it add the -s (he walks, she paints). The practice round mixes these in so the pattern really sticks.

Why it helps

Agreement is easy to hear once you can see it. Watching the very same verb gain or lose its ending as the subject changes from one to many turns an abstract rule into something concrete — and pairing the change with a spoken sentence lets students check it by ear, too.

Good for

Grades 3–8 grammar and writing. It makes a friendly first lesson on agreement and a quick, confidence-building review for any writer who sometimes mixes up runs and run.