Grammar correction for a sentence about salmon — for a 5-year-old

Original: salmon can leap the waterfalls and always goes back to the place where it was born.

Correct (many salmon): Salmon can leap over waterfalls and always go back to the place where they were born.

Correct (one salmon): A salmon can leap over a waterfall and always goes back to the place where it was born.

Very simple for a 5-year-old: Salmon can jump over waterfalls. They always go back to where they were born.

Why these changes?

1. Start with a big letter: "Salmon" instead of "salmon."
2. Say "leap over" or "jump over" (we usually add over), not "leap the."
3. Match the verb to the subject: for many salmon we say "go" and "they"; for one salmon we say "goes" and "it" (or use "a salmon" and "goes").