Paul Quinn wrote to Robert Bashe on Sunday May 13 2018 at 17:25:

PQ> This is just a quick informational note to you.  When you use "it's"
PQ> in the passage above, it translates to "it is" on each occasion.  If
PQ> you ever want to use the shortened form of "it is" then you may use
PQ> "it's".

Apparently the language has changed since I lived in the States. It used to be
that an apostrophe "s" was used as a posessive. And when a word ended in "s", a
simple apostrophe at the end denoted the posessive.

PQ> The other form "its" is the possessive form of the word "it".  It's
PQ> really quite simple.

I agree. Or is this a difference between Australian and American English?

Cheers, Bob

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