Use you're when the subject is you and the main verb is are. The apostrophe (') between you and re is required.
Use your when describing a noun and you is not the subject of the sentence.
There is no apostrophe (') between you and r.
To check your writing for you're/your, use the following steps:
Circle the subjects and underline the main verbs in all of your sentences.
In each sentence, find each your and you're. When you is the subject and are is the verb, you can use you're.
When your is not the subject and is followed by a noun, use your.
Read your writing out loud. Say "you are" whenever you see you're or your.
Write or paste your writing into Microsoft Word. The grammar checker underlines some you're/your errors.
The Spelling and Grammar tool sometimes shows you you're/your errors and suggests corrections.
Note: Word does not find all errors, so it is better to use steps 1-4 to proofread your writing.