This is my brain:
This is my brain when it hurts:
This is my brain when it sees silly grammar mistakes:
Here's one that makes it hurt in particular:
...and just for fun (?) another:
In case you weren't in the know, these sentences are totally incorrect.
...and I see sentences like these a lot.
...and therefore, they make my brain really hurt.
It's a really understandable mistake; English is full of homophones, or words that sound the same (and sometimes are even written the same) but have different meanings. When you write "could of" " would of" or "should of", what you actually mean to write is this:
All of these words (could've, would've, should've) are actually contractions for these phrases:
...so while these sentences in the present perfect may sound like they use the preposition, "of", what they really use is the helping verb, "have".
Easy fix, right?