Quisiera, Pudiera (Polite Forms)

One of the most charming and useful things the imperfect subjunctive does is make requests extra-polite. The -ra forms of querer and poder — quisiera and pudiera — function almost like English "I would like" and "could you," but even softer. They are staples of restaurants, shops, hotels, and formal conversation throughout Latin America.

Quisiera — "I would like"

Quisiera is the first person (or third person) of the imperfect subjunctive of querer. Technically it means "(that) I wanted," but in practice it is used as a polite present-tense request.

You could also say querría un café (using the conditional) or quiero un café (present indicative), but quisiera is by far the most polished register, especially with strangers.

Levels of Politeness

All four are correct. Quisiera and me gustaría are the two softest choices.

Pudiera — "Could you"

Pudiera is the same pattern for poder. It is used to ask for favors and requests.

Again, you could say ¿podría ayudarme? (conditional) and it would be perfectly polite. Pudiera is slightly more formal and deferential.

Quisiera (full conjugation)

Because quisieron is the third person plural preterite, the stem is quisie-.

Pudiera (full conjugation)

Stem is pudie- (from pudieron).

Debiera — "You really ought to"

The same trick works with deber. Debiera softens a suggestion or criticism.

This is gentler than deberías descansar ("you should rest"), and much gentler than debes descansar ("you must rest").

Only the -Ra Form Works

This polite use is exclusive to the -ra form. You cannot say quisiese un café or pudiese ayudarme — those sound strange or archaic. This is the one grammatical difference between the two forms of the imperfect subjunctive.

You have now completed the imperfect subjunctive. Review -ra forms for conjugation, si-clauses for hypotheticals, or -ra vs -se for the grammatical difference.