Corrected sentence: A hovercraft glides on the surface, moving easily over swamps, ice, and snow.
Why this is better (for a 7-year-old):
- Start with a big letter: The sentence should begin with 'A' not 'a'.
- Use commas in a list: When you name more than two things, put commas between them: 'swamps, ice, and snow.' The comma before 'and' is optional, but it's fine to use it.
- Clearer verb: 'Moving easily over' is a simple way to say how the hovercraft travels. 'Overcoming' is okay too, but it sounds a bit harder to understand.
So, use the corrected sentence above. Great job checking your grammar!