One of the things I love about Forms is that the questions are so easy to edit. You just click on the question, and you can make any change you want to it.
You can also reorder the questions with ease by clicking the up or down arrows, and if you want to delete a question, just choose the trash can icon.
You can also copy an existing question and it will create a duplicate question underneath the current one, so you can have the same settings or the same answers, and then just change the question. This was very helpful for me because I had four questions with the same four available answers, but of course each question had a different correct answer. Using the copy function saved me time in typing up the answers over and over again.