Subject-Verb Agreement

In a sentence, the subject must agree with the verb. Sometimes, it helps to read the sentence out loud to make sure that the subject agrees with the verb.

The sun shines brightly.
The coyote yawns when it is tired.

Incorrect: The girls eats dinner. (The girls eat dinner.)
Incorrect: Dogs is good pets. (Dogs are good pets.)
Incorrect: The stars twinkles in the sky. (The stars twinkle in the sky.)