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It's all the same apostrophe, but it is used in a couple of ways.
One is to show possession: John's is a singular possessive, Johns' would be plural possession. The exception to this is the posessive of "it" which is "its".
The apostrophe is also used in contractions to show that letters have been taken out. "Do not" becomes becomes "Don't" and so on. You could use this for "John's angry," the meaning is clear from context.
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