You will never us a, an, the, or is after YOUR.
If you think the correct spelling might be YOU'RE, say it as you are to double check whether it makes sense.
You will never us a, an, the, or is after ITS.
If you think the correct spelling might be IT'S, say it as it is to double check whether it makes sense.
Thank you to Katie W. and Brittney L. for this tip!