Let's look at the sentence: "Roadrunners run better than they fly and smartly catch snakes and spiders."
Here's how we can improve the grammar and make it sound better:
- Make sure verbs match and are parallel: When you join two actions with "and", it's good if the verbs are in the same form. You have "run" and "catch", both simple present verbs, which is good.
- Use "better than they fly" properly: The phrase "run better than they fly" is okay, but often people say "run better than they can fly" to be clearer.
- Adverb placement: You wrote "smartly catch", but usually for animals doing something skillfully, we say "catch snakes and spiders smartly" or "catch snakes and spiders cleverly". Placing the adverb after the verb is common.
A better way to write the sentence is:
"Roadrunners run better than they can fly and catch snakes and spiders smartly."
Or to make it even clearer:
"Roadrunners run better than they can fly and cleverly catch snakes and spiders."
So, the main corrections are about adding "can" for clarity and placing the adverb after the verb for natural sounding.