Grammar / C1 Grammar lessons and exercises / Inversion and Conditionals
Conditional sentences can be formed without if by using inversion. Inversion means changing the normal subject–verb order. This structure sounds more formal.
Should you have any questions, I will be happy to help.
Were they to sell their house today, they would make a huge profit.
I would've taken you out for lunch had I known you were in town.
The first conditional is used for future situations that we think are possible.
If you ever need a marker pen, they are in the cupboard.
✅ Should you ever need a marker pen, they are in the cupboard.
Structure
Should + subject + infinitive
This form makes the situation sound slightly less likely and is often used for polite requests or offers.
The second conditional is used for situations that we consider unlikely or impossible.
If everyone reduced their meat consumption, how would the environment be affected?
✅ Were everyone to reduce their meat consumption, how would the environment be affected?
Structure
Were + subject + to + infinitive
If the original second conditional uses the verb be, we do not need to + infinitive. We simply use were and invert the subject and verb.
If California were a country, it would be one of the world's largest economies.
✅ Were California a country, it would be one of the world's largest economies.
The third conditional imagines how a past situation could have been different.
If we had lost that match, it would've been a disaster.
✅ Had we lost that match, it would've been a disaster.
Structure
Had + subject + past participle
In negative inverted conditionals, not comes after the subject.
Should you not consent to sharing this information, you may inform our company at any time.
Were I not good at maths, I'd find this homework very challenging.
Had I not been busy this morning, I would have attended the meeting.
| Conditional | Normal form | Inverted form |
|---|---|---|
| First | If you need ... | Should you need ... |
| Second | If you changed ... | Were you to change ... |
| Third | If you had known ... | Had you known ... |
❌ Should you will need help, call me.
✅ Should you need help, call me.
❌ Were he change his mind, ...
✅ Were he to change his mind, ...
❌ Had not I known, ...
✅ Had I not known, ...
First conditional: SHOULD
Second conditional: WERE
Third conditional: HAD
Negative: put not after the subject.