Inverted conditionals sentences without if
If the first verb if is were, should or had, we can drop the if &begin with an inversion .
Should you go to the supermarket,buy me some apples.
Were I less pessimistic, I would see that everybody is happy with my party.
Had he gone to the party , he would have seen Mary hanging out with John.
Here the verb takes the same form that it does in questions , using do or did if necessary
No sooner/ Hardly/Scarcely + past perfect
The following are used with the past perfect to describe an event that happened immediately after another.
No sooner had the car started than I saw Brad Pitt.