You can suggest changes to a document without changing the original text. If the owner approves your suggestions, they replace the original text.
Suggest changes to a file
On your computer, open a document at docs.google.com. In the top right, if you don’t see "Suggesting," click Editing Suggesting. If you don’t see this option, ask the file owner to let you suggest changes.
Edit the document.You’ll see your change in a new color. Anything you delete will be crossed out.
To add more detail, click your suggestion and type a comment. Then click Reply.
The owner of the file will get an email about your suggestions and can decide whether to keep them.
