SPOT THE ERROR, CONDITIONALS IV

Happy Thursday to you all! How's your week going? I hope you're enjoying it.

It's the fourth day of our Spot-the-Error with Conditionals theme. Let's see if you can find the mistake in the sentence below. It is supposed to be a Third Conditional, but there is a mistake in it. 

Sentence: Had I know you were coming, I would have bought an extra ticket. 

Hint: the mistake is in the first part of the sentence. Did you spot it?

Give us your answer on one of our social media sites (Facebook or Twitter) and we will post the correct answer later.

Facebook: https://www.facebook.com/ZigguratEscuelaCorporativadeIdiomas

Twitter: https://twitter.com/ZigguratIdiomas

We will also include the correct answer in tomorrow's Daily Vitamin email.

Thank you for participating and good luck to you!