1st Conditional (Should)

Should + S + V₁, ... (= If + present simple, ...)

2nd Conditional (Were)

Were + S + ..., ... (= If + S + were/past simple, ...)

3rd Conditional (Had)

Had + S + PP, ... (= If + S + had + PP, ...)

Key rule

Omit 'if' | Place auxiliary (Should/Were/Had) BEFORE subject | Comma after inverted clause

Should you require further information, please contact our support team.

Were I in charge, I would restructure the entire department.

Had they checked the specifications, they would have avoided the error.

Should the client request changes, we will revise the proposal accordingly.

Were the budget approved, the project could begin immediately.

Had the team invested in testing, the launch would have been smoother.

Should you need assistance, do not hesitate to reach out.

Were she available, she would be the ideal candidate for the role.

Had the report been submitted on time, the delay could have been avoided.

Should any issues arise, the IT team will be on standby.

Had the team check the specifications, they would have avoided the error.

Had the team checked the specifications...

3rd Conditional inversion: Had + S + PAST PARTICIPLE (not base verb).

Should you will need assistance, contact HR.

Should you need assistance, contact HR.

After 'Should' in inversion, use base verb — never 'will'.

Conditional Inversions

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