Watch How to Use the Collaboration and Editing in Google Forms:
Now with collaboration
Create a form faster than ever. Just as with Docs, Sheets and Slides, you can now collaborate with others in real-time. If you need to work with two colleagues on a survey, all three of you can work on the same form simultaneously and even have a group chat on the side, without leaving the form.
Even if you’re working solo, some new changes will make creating and editing forms easier. All your changes are auto-saved and you can quickly undo/redo edits. Improved copy-and-paste will let you copy a list of bullets from the web or multiple rows of text from a spreadsheet; then, when you paste into a form, each line will be appear as an individual answer. And you can use keyboard shortcuts to get things done more quickly.
Reference: Google Gooru - Collaboration with Google Forms