In creating a Google Form it is likely you realize that you forgot a question and need to insert a question in the middle of the Form.
One method is to select the “add item” button at the bottom and then drag the question up to the location in the Form where the question needs to be. This can be a drag (pun intended) if you have a lot of questions.
Click on the question above where you want to insert the new question.
The question you insert will appear below the question you clicked on. Example, if you want a new question #5 click on question #4 and use the insert menu to insert a question into the #5 spot.
When you insert a question or re-arrange the questions in the Google Form the question order in the spreadsheet is unchanged.