Great explanation of "if" clauses and when to use the present indicative tense. A short exercise tests the student's mastery of the principle and reviews a variety of present tense conjugations. Answers may be checked and corrected.

Comprehensive lesson on how to conjugate verbs in the present subjunctive. Regular and stem-changing verbs are presented in this explanation. A quiz at the end of the lesson tests the student's mastery of verb conjugations in the present...

This Spanish grammar exercise provides excellent practice conjugating verbs in the present indicative tense. Fifty-six different infinitives give the student plenty of practice with regular, irregular, and stem-changing conjugations. A...

Learn and practice the correct formation of stem changing verbs in Spanish. A link to interactive verb conjugation practice is provided under the grammar explanation.

Learn to simplify radical expressions by removing radicals from denominators. The demonstration includes both single radicals and binomials that require the use of a conjugate.

This Spanish grammar exercise provides excellent practice in conjugating present subjunctive verbs. Fifty different infinitives give the student plenty of practice with spelling changes and regular, irregular, and stem-changing...

Wonderful practice conjugating verbs in the present subjunctive. Sentences illustrate conjugations that have spelling changes or are regular, irregular, or stem-changing verbs. The "vosotros" form is used in some exercises. All six...

Through this exercise, students practice conjugating a variety of irregular verbs in the preterite tense. Read the sentences, view the picture and type in your response. To check your answer just click on the drop down arrow next to...

An online introduction to stem-changing verbs in the preterite tense. A quiz at the end of the lesson tests the student's mastery of these conjugations.

This site is designed to be a supplement for students of organic chemistry. Its tutorials and self-grading tests are interactive and extremely helpful.