Question

Is the expression correct. You'll come home safer if you leave before dark

Answer 1

It's understandable, but not the most natural phrasing.

Difference:
- "safer" is an adjective (comparative). "You'll be safer if you leave before dark" (compare your overall safety in the two situations).
- "safely" is an adverb (manner). "You'll come home safely if you leave before dark" (describes how you'll come home).

More natural alternatives:
- "You'll come home safely if you leave before dark."
- "You'll be safer if you leave before dark."
- "If you leave before dark, you'll get home safely."

Any of those would be clearer and more idiomatic.