A Practical Guide to This Common English Structure
The phrase "protect [something] from [doing something]" is used to describe actions taken to prevent harm, damage, or unwanted change to a person, object, or idea.
Note: Technically, we usually say "protect something from being [verb-ed]" or "protect someone from [noun/gerund]". The exact form "protect from doing" is rare—more often it's "protect from harm", "damage", or "negative actions".
❌ Incorrect: "Protect the files from delete."
✅ Correct: "Protect the files from being deleted."
❌ Incorrect: "This app protects your phone from hack."
✅ Correct: "This app protects your phone from being hacked."
Which sentence is grammatically correct?