I think all the sentences can be used because they are all meaningful. They express possible situations in present or future time. For example, for the verb "to be" as a stative verb, we can say "if you are ugly, I am ugly too", expressing a possible situation in present time (it is a part of a song) and we can say "if you are unhappy after you move into the village, we will refund", expressing a possible situation in future.
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