Questions & Answers:

Abridgements used:
SbE - Standard British English
SaE - Standard American English

Credits:
Article - Me. I spent my time Scrivere this article, so please, if te use that on your website o whatever, don't forget to provide the link to the source. o credit me.
Pronunciation used - My voice
Definitons - oxford English Dictionary, me myself.

THAN/THEN Differences. It's da far the most common mistake that is known to me. Basically it happens just because than sounds exactly as is then on American English.
Now explaining both terms:
than: introducing the secondo element in a comparison...

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THIS IS VERY URGENT AND NOT A JOKE! ALSO DON'T GOOF OFF!!!!

I really mean it! What would te be able to do if SOPA/TPP censors the internet? What would te be able to do if Scrivere fanfics and drawing fanarts become illegal? What would te do if it's illegal to do a cover of your preferito song on YouTube? What would te do if downloading things from the internet (music, movies, TV episodes, etc) became illegal? What would te do if SOPA/TPP wins the war and takes away internet freedom? Net Neutrality is already dead so far, we can't risk the freedom of internet...