Warning: This page will make you a grammar ninja, but at the cost of your sanity.
Subject-verb agreement is the secret ingredient in every good sentence. It's the glue that holds your writing together.
Here's a few examples of subject-verb agreement in action:
She sells pencils.
The they eat cheese.
My we drink coffee.
For bonus points, try to come up with your own examples!
Or, if you're feeling brave, try the Challenge Mode and see if you can create the most convoluted subject-verb agreement sentence ever.