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Inverted conditionals

Form:

Should I/you/he/etc ... instead of If I/you/he/etc should ...
Were I/you/he/etc ... instead of If I /you/he/etc were ...
Had I/you/he/etc ... instead of If I /you/he/etc had ...

Use Example
More formal form of the first conditional (with should) Should the situation worsen, the United Nations is prepared to send in a peacekeeping force. ( = If the situation should worsen. . .)
More formal form of the second conditional Were the situation to worsen, the United Nations would be prepared to send in a peacekeeping force. ( = If the situation were to worsen. . .)
More formal form of the third conditional Had the situation worsened, the United Nations would have been prepared to send in a peacekeeping force. ( = If the situation had worsened. . .)

Watch out!

For all conditional sentences (first, second, third, mixed, inverted), when the condition comes before the result it is usually followed by a comma.When the result comes first, no comma is necessary.
✓ If I had a mobile, I would have called you last night.
✓ I would have called you last night if I had a mobile.

• In conditional sentences, modals (will, would, could, etc) are sometimes followed by a continuous infinitive.
✓ We'd still be waiting if you hadn't turned up

US vs UK Grammar
• With second and third conditionals in informal conversation, speakers of American English sometimes use would or would have in the if clause.This is very unusual in British English.
US: How would you feel if this happened/would happen to you?
UK: How would you feel if this happened to you?
US: I would have felt awful if that had happened/would have happened to me.
UK: I would have felt awful if that had happened to me.

Form - Mixed conditional Exercise - A


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