How gramatically correct are you?

Sorry. I can't help but to duplicate this post.

Bow before me you lowly mortals!

Try it!


You are a GRAMMAR GOD!

Congratulations! If your mission in life is not already to preserve the English tongue, it should be. You can smell a grammatical inaccuracy from fifty yards. Your speech is revered by the underlings, though some may blaspheme and call you a snob. They're just jealous. Go out there and change the world.

How grammatically correct are you? (Revised with answer key)
brought to you by Quizilla