There are two forms of imperfect subjunctive, which are used indistinguishably. See the box to the right for instruction in the formation of the imperfect subjunctive.

One of the most common uses of the imperfect subjunctive is in a si clause. In such a clause it has a hypothetical meaning.

Si fuera española, no le costaría nada.
If you were Spanish, it would not cost you anything.

Si fueran invitados al coctel estoy seguro/a de que irían.
If they were invited to the cocktail party, I'm sure they would go.

Si fuera tan rico como tú sería igual de aburrido.
If I were as rich as you I would be just as boring.

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