Thread:TheEmpressOfDeath/@comment-4786757-20190622184925/@comment-36836718-20190703135226

I masked some of the native speakers here and they said you can use "it is" and "it's" interchangeably. It's can also be an informal short form for "it was" and "it has". Do you remember which of your sources said you should use "it's" when talking about past actions?