Grammar check for a 7-year-old: correcting “The walrus uses its tusks to pull itself on the ground”

Good sentence! It just needs a small change to sound natural. Here are two better ways to say it:

• For moving across the ground: The walrus uses its tusks to pull itself along the ground.
• For coming out of water onto land or ice: The walrus uses its tusks to pull itself onto the ice.

Why change it?

1. The words "uses," "its," and "itself" are correct. ("Walrus" is singular, so we use "uses".)
2. We change the small word (the preposition) to match the action: "along" means moving across the surface, and "onto" means moving from water up onto the ground or ice.

Short and simple: If the walrus is dragging itself across the ground, use "along the ground." If it's climbing out of the water, use "onto the ice." Want to try fixing another sentence?