it’s or its?

If it is a contraction of it is, then it should be it’s.

So: It’s time for us to get a new bell.

If it is the possessive (a pronoun that indicates that something belongs), then it should be its.

So: The monster flashed its tail and the tree fell.

you’re or your

If it is a contraction of you are, then it should be you’re.

So: If you’re going to be late, please let me know beforehand.

If it is the possessive (a pronoun that indicates that something belongs to you), then it should be your.

So: I found your umbrella in the basement.

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