tests by hidalgo with the online test builder (653 tests)

501. Imperative: affirmation & negation (5949 candidates)
502. Ser/Estar (5587 candidates)
503. Prepositions (1506 candidates)
504. Preterite tense (Pretérito indefinido) (10359 candidates)
505. Expressions with TENER (1021 candidates)
506. Conjunctions Y(E), O (U) (4304 candidates)
507. Prepositions (2027 candidates)
508. Clothes (1756 candidates)
509. Por qué, por que, porque, porqué (1565 candidates)
510. Infinitive or "que + subjunctive" in a subordinate (2826 candidates)
511. Prepositions (1426 candidates)
512. Personal pronouns (852 candidates)
513. Gender of nouns (917 candidates)
514. Antonyms (1487 candidates)
515. Present => Past and vice versa (996 candidates)
516. Imperative mood (affirmative and negative commands) (969 candidates)
517. Infinitives (785 candidates)
518. Subjunctive imperfect (838 candidates)
519. Preterite tense (Regular verbs) (14312 candidates)
520. Synonyms (verbs) (705 candidates)