While I understand that the UNDO button can be very dangerous, I also understand that it save lots of headaches avoiding accumulating a bunch of trashy ghost reviews.
When should I press it? I was thinking of these reasons:
You misspelled one thing that you really shouldn’t have misspelled (typo)
The question was actually looking for the polite form and you put the casual, and the question marked it incorrect without warning you. This happens very frequently because the moment you type the first letter into the box, you will no longer be able to see if the question says [casual] or [polite]
You put a verb in the past tense, but it’s looking for the present tense and doesn’t warn you. Almost everything in English reads as if it’s in a past tense, so this happens more than I’d like it to.
When is the best time to hit that Undo button?