What is the best way to fix this sentence fragment if it a Hit stone hard?

The sentence "If it a Hit stone hard" is a fragment because it lacks a complete subject and verb. Here are a few ways to fix it, depending on what you want to say:

1. Add a subject and verb:

* "If it hits the stone hard, it will break." This adds the subject "it" and the verb "hits" to create a complete sentence.

2. Add a complete clause:

* "If it hits the stone hard, it will make a loud sound." This adds a complete clause ("it will make a loud sound") to create a complete sentence.

3. Reword the fragment to make a complete sentence:

* "The stone is hard, and it will hit it hard." This completely rewords the fragment into a complete sentence.

The best way to fix the sentence fragment depends on the context and what you are trying to communicate.