Often, but certainly not always, international students (and even some domestic students, for whom English is not their primary language), write worse than their domestic peers who have grown up with English. 

For most assignments, I take up to a couple points off for negligence of spelling and grammar, depending on how badly the writing was. 

I'd like to give grace to those for whom English is not their primary language. At the same time, I need to be fair and grade equally. As it stands, I grade equally for everyone, but I try to give more feedback to those who need it. 

Does anyone have any better ideas about how to do this?