Its time for it’s medication, I’ll be rite back.
I strongly suggest including “its” and “it’s”.
The ones I see mixed up the most (on THIS board, even!) are then (sequence) and than (comparison), and affect change) and effect (result).
Do NOT let her join this board until she knows the difference.
PS: There is definitely no A in definite!
Is this another ‘cot’ versus ‘caught’ issue?
‘Since’ and ‘sense’ are not homophones to me at all. Well, neither are ‘cot’ and ‘caught’ but I’ve given up on that battle.
Yes, and no. In my dialect in my head, they don’t sound alike. When speaking aloud at conversational speed, they do sort of muddle together. (Chicago)
The misuse of too, to and two and there, their and they’re, are the ones that drive me nuts.
Good for you!
Their car needs its brakes replaced. They’re going to get them from that shop over there. It’s a bit expensive, but those are the breaks.
It needs two of its windows replaced, too, but it’s too expensive to do two.
So you have neither the cot-caught merger nor the pin-pen merger. How about the marry-merry-Mary merger?
Another one that bugs me: site, cite, and sight.
You can be cited for trespassing if you are sighted at the wrong site.
Listen to Webster and decide.
http://www.merriam-webster.com/audio.php?file=sense001&word=sense&text=
http://www.merriam-webster.com/audio.php?file=since001&word=since&text=
I hear little difference at all and Webster is a pretty good authority. “Sin” as in you sinned, is a bit stronger in since. But in my region both words are pronounced pretty much as “cents” with a shh sound at the end.
Mom was a legal secretary. I can still hear her telling me “sep A rate”. 
flaunt and flout
When she’s mastered all the above, point her toward The Chaos poem.
The rain reigns supreme in Seattle, but is reined in a bit down in Berkeley.
First, my sincere thanks for all the replies, and sincere apologies for letting this topic rest like I did.
There is so much good stuff here, I just wonder if anyone could possibly write a coherent story in a few paragraphs, using every form of every common mistake cited?
Haha, if that’s even possible, the author could go down in history, I think.
I don’t claim to know everything, and I probably even have mistakes in this post, but if you’re up to the challenge, I’m sure we’d all like to see it.