Conditional Sentences by Inversion

In formal English conditional sentences can be formed by inversion of subject and auxiliary. Also, if is removed.

Consider these examples:

Unreal present

• Were I you, I would visit grandfather.
• Had I some money, I would buy myself a hotdog.

Unreal past

• Had I known this fact before, I wouldn't have come here.
• Had Jake been informed about the meeting, he would have participated.