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It is possible for the two parts of a conditional sentence to refer to different times, and the resulting sentence is a "mixed conditional" sentence. There are two types of mixed conditional sentence:
The tense in the 'if' clause is the past perfect, and the tense in the main clause is the present conditional:
IF' CLAUSE | MAIN CLAUSE |
If + past perfectIf I had worked harder at school | Present conditionalI would have a better job now. |
In these sentences, the time is past in the 'if' clause, and present in the main clause. They refer to an unreal past condition and its probable result in the present. They express a situation which is contrary to reality both in the past and in the present:
The tense in the If-clause is the simple past, and the tense in the main clause is the perfect conditional:
IF' CLAUSE | MAIN CLAUSE |
If + simple pastIf I wasn't afraid of spiders | Perfect conditionalI would have picked it up. |
In these sentences the time in the If-clause is now or always, and the time in the main clause is before now. They refer to an unreal present situation and its probable (but unreal) past result:
a. If she wasn't afraid of flying she wouldn't have travelled by boat.
b. I'd have been able to translate the letter if my Italian was better.
c. If I was a good cook, I'd have invited them to lunch.
d. If the elephant wasn't in love with the mouse, she'd have trodden on him by now.