remove the word "of" from all literature

In this land we have had poor use of the word "of" as a replacement for "have" by many.

"He could of (HAVE) done it".

We have had "OFF" also used incorrectly.

"He took it off (FROM) him". Unless it was ON his head!

The US compounded it and it seems to be infiltrating Aus.

"He took it OFF OF him." AARGH!

The US idea of ending sentences with AT is invading us.

I don't know where he's AT (where he is).

Adverbs have lost "ly" on the end.

I was walking quick (LY).

Then we get "I was bit (BITTEN) by a snake" etc.

For anyone who passed kindergarten English, how is it that news reporters etc in the US and increasingly here can arrive at this.

"I think he done it. It happened real quick. We don't know where he's at, but we got the number off of his vehicle".

Sorry Miss Martin, I did love you in year 1, but your work was in vain!