Hi!
If I were you then I would mail the postcard.
This sentence is an example of type 2 Conditional. It is used to express imaginary situations which are contrary to facts in the present and, therefore, are unlikely to happen in the present or future.
the rules:
If-clause
If + past simple/ past continous
Main clause
would/could/might + present bare infinitive
If I were you then I will mail the postcard.
This sentence is confusing. Either it is incorrect or it is mixed conditional( type 2 if-clause & type 1 main clause).
I don't know whether GMAT permits mixed condtionals.
Source: Grammar 4, Enterprise Student's book
Hope it helps!
Best,
Maciek
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