Great explanation of how to conjugate the six irregular verbs in the present subjunctive: dar, estar, haber, ir, saber, and ser. A quiz at the end of the lesson tests the student's mastery of irregular conjugations in the present...

Excellent explanation of formal commands in Spanish that use the pronouns "usted" and "ustedes." Stem-changers and irregulars are included in this lesson. Ample examples illustrate the formation and use of formal commands. A quiz at the...

This verb conjugation site is a great review of the formation of the forms of the regular preterite forms as well as those with spelling changes, stem-changes, and irregular forms. All sections have links to verb conjugation practice.