There's not an awful lot on the Internet or in grammar books on the inversion of conditionals, so I thought I'd take quite a detailed look at it, with plenty of exercises.
This post consists of:
- Four introductory exercises
- The basic principles
- First conditional - exercise
- Second conditional - exercise
- Third conditional - exercise
- Inverting negatives
- Mixed conditionals
- If it wasn't/weren't/hadn't been for ... - exercise
- Bringing it all together - exercise
- Should - advanced point - aspect
- How do we know when we can invert in real tense conditionals?
- Exceptions - should, have and were to have done
Should you find the introductory exercises too difficult, or would prefer to go straight the explanation, you can skip (miss out) the first section.
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A note about the exercises
The following exercises are all text entry. You don't need to add any punctuation.
Real present / future conditionals, including First conditionals.
Inverted versions start with should. So where needed, add should to the condition clause and change the verb to the bare infinitive if necessary. Remove if and invert should and the subject.
- If she sees Peter, she'll pass on the message.
If she should see Peter, she'll pass on the message.
Should she see Peter, she'll pass on the message.
- If they are interested, we'll send them a price list.
If they should be interested, we'll send them a price list.
Should they be interested, we'll send them a price list.
Note - We can't always invert Real present / conditionals, but we'll look at when we can and when we can't a bit later.
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Unreal present / future - Second conditional
Inverted versions start with were. We can invert the verb to be and past continuous directly, but we must change was to were.
- If she was older, it would be better
Were she older, it would be better
- If he was offering us better discount, we would accept
Were he offering us better discount, we would accept
With other verbs in past simple, we need to change the verb to the were to construction before inverting.
- If the government introduced this tax, it would affect a lot of people.
If the government were to introduce this tax, it would affect a lot of people.
Were the government to introduce this tax, it would affect a lot of people.
We seem to be able to invert more or less any Second conditional in this way.
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Unreal past - Third conditional
Inverted versions start with Had. We already have auxiliary had, so we don't need to add anything. We simply remove if and invert the subject and had. Inversion seems to work with all Third conditionals.
- If she had known how he would react, she would never have said it.
Had she known how he would react, she would never have said it.
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Inverting negatives
So far we've only looked at positive sentences. Notice that with inverted negative conditionals, we can't use contractions :
- If she doesn't phone soon, we'll have to leave
Should she not phone soon, we'll have to leave.
NOT Shouldn't she phone, ...
- If he wasn't a diplomat, he wouldn't have immunity.
Were he not a diplomat, he wouldn't have immunity.
NOT Weren't he a diplomat, ...
- If he hadn't told me himself, I'd never have believed him.
Had he not told me himself, I'd never have believed him.
NOT Hadn't he told me himself, ...
Mixed conditionals
We can invert mixed conditionals with were or had, depending on whether the condition clause relates to the present or the past
- Had he not worked so hard, he wouldn't be where he is now.
(3rd / 2nd) - past condition, present result
- Were he not so lazy, he would have passed his exams.
(2nd / 3rd) - present (general) condition, past result
If it wasn't / weren't / hadn't been for
This is an idiom used to say that "somebody/something stopped somebody/something from happening" (Oxford Advanced Learner's Dictionary). As in Second conditionals, we can use was or were (more formal).
We can invert these expressions in the same way as with Second and Third conditionals. And as with Second conditionals, when we invert we must use were and not was.
Note - We have several expressions like this ending in for. There are except for and but for, as in the saying There but for the grace of God, go I which you might say when you see someone in a less fortunate situation than yourself, and which we could transform as If it wasn't for the grace of God, I would be in a similar situation.
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Bringing it all together
Exercise 8a - Rewrite the conditional clause in inverted form
1. | If you bump into Mike at the conference, give him my regards. , give him my regards. | |
2. | If we offered you the position, when would you be able to start? , when would you be able to start? | |
3. | If she had passed her driving test, she could hire a car. , she could hire a car. | |
4. | If it wasn't for Peter's advice, I don't know how we would have managed. , I don't know how we would have managed. | |
5. | If they hadn't gone to the same university, they might never have met. , they might never have met. | |
6. | She might have found him rather attractive if he wasn't such a prig. She might have found him rather attractive . | |
7. | If Sam's not in the office, he's probably in the coffee room. , he's probably in the coffee room. | |
8. | If it hadn't been for Samantha's brilliant idea, this success story would never have happened. , this success story would never have happened. | |
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Exercise 8b - Rewrite the conditional clause in inverted form
1. | He would be there now if he hadn't missed his train. He would be there now . | |
2. | We could expand our operations if the current climate wasn't so difficult. We could expand our operations . | |
3. | If I'm not there when you arrive, please ask for my assistant. , please ask for my assistant. | |
4. | If she hadn't failed that exam, she wouldn't still be at university. , she wouldn't still be at university. | |
5. | If the company was prospering, we would be able take on more staff. But, as you know, that is not the case. , we would be able take on more staff. But, as you know, that is not the case. | |
6. | We can meet inside the cinema if it happens to be raining. We can meet inside the cinema . | |
7. | We think it would be better if the candidate reapplied after gaining some more experience in the field. We think it would be better after gaining some more experience in the field. | |
8. | We could have had serious PR problems if it hadn't been for the excellent way Martin handled the press. We could have had serious PR problems Martin handled the press. | |
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The story so far
This is probably as much as you need to know about inversion in conditionals for any tests or exams you are likely to take. It's also about as much as most EFL/ESL materials will tell you. But I now want to look at it in a bit more detail. So, apart from how to construct inverted conditionals, we know that:
- Inversion seems possible with nearly all unreal conditionals, Second, Third and Mixed.
- With real conditionals, however, things appear to be a bit more complicated. So we'll now have a bit of a closer look at real conditionals.
How do we know when we can invert in real tense conditionals?
As I said earlier, we can't always invert Real present /future conditionals or all First conditionals.
If we can reasonably add should to an if clause, then we should be OK. In this context should has nothing to do with obligation, but refers to the possibility or chance of something happening or being true. It suggests that something is possible, but unlikely. It has a similar meaning to by any chance or either happen to or chance to:
- If you meet him, you'll see what I mean.
If you should (by any chance) meet him, you'll see what I mean.
Should you ( by any chance) meet him, you'll see what I mean.
- If they are interested, we'll send them a price list.
If they should (happen to) be interested, we'll send them a price list.
Should they (happen to) be interested, we'll send them a price list.
- If she sees Peter, she'll pass on the message.
If she should (chance to) see Peter, she'll pass on the message.
Should she (chance to) see Peter, she'll pass on the message.
Although I can find no information in any reference work about this, I don't think it seems to work when we're talking informally about actions over which we have some control. But see Exception 1 below:
- If you do the washing up, I'll put the children to bed.
If you should do the washing up, ...
Should you do the washing up, ...
- If Jim lifts that end of the table, I'll lift this end.
If Jim should lift that end of the table, ...
Should Jim lift that end of the table, ...
There are also some real-time conditionals which don't follow the First conditional pattern where we can use should:
- If your friends are hungry, there's plenty to eat in the fridge.
If your friends should be hungry, there's plenty to eat in the fridge.
Should your friends be hungry, there's plenty to eat in the fridge.
- If you want to catch the 4pm train, you'll need to leave now
If you should want to catch the 4pm train, you'll need to leave now
Should you to want catch the 4pm train, you'll need to leave now. .
A couple of exceptions
Although still using should, were and had, there are a couple of exceptions to the rules above. I've never seen the second two mentioned in any lesson on inversion in conditionals and I don't think these would ever come up in an exam. I'm certainly not suggesting you should try using them, but you might come across them in a book or text of some sort.
Exception 1. Should in Second conditionals
We sometimes use a Second conditional to make a suggestion more tentative or polite, in negotiations for example. In these cases we can sometimes use should and inert with should instead of were (to).
- If you increased your order, we could consider free delivery.
- If you should increase your order, we could consider free delivery.
- Should you increase your order, we could consider free delivery.
Exception 2. Have for possession in Second conditionals
We sometimes invert the verb have for possession in second conditionals with had rather than were when the condition is definitely not true.
- If I had the inclination, I would work harder; but I don't.
Had I the inclination, I would work harder; but I don't.
- If we had the necessary time and resources, we could go ahead with this project. But unfortunately, we don't.
Had we the necessary time and resources, we could go ahead with this project. But unfortunately, we don't.
It occasionally happens with have to for obligation too:
- If I had to choose between the two locations, I think I would select Spain.
Had I to choose between the two locations, I would choose Spain.
This only happens with have to and have for possession. We can't do it when have is an action verb:
- If we had lunch earlier, we could start the meeting at 1.30.
Were we to have lunch earlier, we could start the meeting at 1.30.
NOT Had we lunch earlier, ...
Exception 3 - Were to have done something in Third conditionals
Sometimes a construction with were to have + past participle (3rd form) can be used instead of had in a third conditional. This can suggest that something is even more hypothetical or sometimes suggests that the consequences would have been very serious. We can invert this with were.
- If the police were to have found out, he would have been in trouble.
OR If the police had found out, ...
- Were the police to have found out, he would have been in trouble.
OR Had the police found out, ...
Postscript 1 - Question forms instead of if
Sometimes we use will and would in the if clause to make a request or order more polite.
- If you will just fill out this form for me.
- If you would follow me, please.
These can also be inverted into normal question form, but are less formal:
- Will you just fill out this form for me?
- Would you follow me, please.
Postscript 2 - Were I you, ...?
I've seen examples of Were I you, ... on a couple of websites, for example - Were I you, I would stop smoking. I have to say that this does not seem to me a very natural sounding sentence. Firstly, we have a very strong existing standard expression - If I were you. Secondly, this seems rather formal for what is really a bit of personal advice. And thirdly, I don't think we often use inversion in very short clauses like that, although admittedly - Were I in his shoes, I would behave differently - sounds fine to me.
Postscript 3 - Are to ...
Were to has a present equivalent are to, more or less meaning going to:
- If we're to catch the 14.00 train, we'd better leave now.
- They'll need to work a lot harder if they're to pass the exam.
We can't invert are to in the same way as were to.
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