Both A and B practically mean the same thing. C reads odd to me though.

@Warsaw Will

I don't quite understand your second post. You say, "...that didn't happen *after* the main event..." Do you mean before there or could you elaborate?

* viola should voila.

' "...But if [you think] you [can] keep coming in late to work, you've got another [think] coming." '

Some insertions and viola. You have the 'think' version. Moreover, the idiom isn't based off grammar; a number aren't.

@Warsaw Will

Agreed. Passives are perfectly fine.

@Will I Am

Don't believe nonsense like "adverbs" and "adjectives" (I insert this because I have heard adjectives treated similarly) are bad. By whose standards are adverbs bad? Why would a word class (part of speech) exist if we are going to eschew like a plague?

@Spence

The Xmas isn't actually "exing" out Christ, but in reality stands for the Greek letter chi, the starting letter, in Greek, of "Christ". Here is the source for that:

http://en.wikipedia.org/wiki/Common_English_usage_misconceptions#Semantics

You'll have to scroll down a little.

*"the" should be "than"

@aragond

You are either unfathomably stupid or you are just trolling. The latter is truer. But I'll indulge you.

Let's begin with your errors:

1. Commas are used more the connecting clauses.
2. Commas are not to connect two independent clauses, unless, of course, there is a coordinating conjunctions.
3. "Off a horse" is a prepositional phrase, not a clause.
4. English does clear define the subject and object.
5. English, I believe, does have a rigid syntactic order.

*Scratch out the second 'not'.

I don't think the phrase is not even logical. Tomorrow, I believe, is a blend of the preposition 'to' with morrow, which means the following day. Other phrases that have merged are hereto, herewith, nevertheless, nonetheless, etc. So technically the phrase on tomorrow is actually on to morrow.