How does the next paragraph end?

How to read for punctuation and grammar mistakes
Set the text aside.
It is very common to miss mistakes when editing your own work, especially if you've just written it. You end up reading for what's in your head and not what's written down on paper.
Setting a work aside for a day or so can allow you to get the space you need to spot errors. Ideally, the longer you set a text aside, the better.