In formal situations, we can use "had + (subject) + verb" instead of "if subject had":

Had I known you were waiting outside, I would have invited you to come in.
= If I had known you were waiting outside…

Fill in the missing "Had + subject + verb" structures according to the hints below.

1. the size of her apartment, she wouldn't have moved to NYC with her horse.
= If Pippi had realized

2. it was going to rain, she wouldn't have built her house out of gingerbread.
= If the witch had known

3. me about the vampires, I would have stayed away from that eerie castle.
= If you had told

4. earlier, I would have fallen in love with you.
= If we had met

5. put to sleep in a magical castle for 100 years, I would have resuscitated you.
= If you had been

6. a poison apple served by a witch, would you have taken me to the hospital?
= If I had eaten

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Maximum number of points: 6/6