tests by hidalgo with the online test builder (950 tests)

501. Tanto (8889 candidates)
502. From another tense to present tense (1800 candidates)
503. Gérondif ou participe passé (10028 candidates)
504. #el que#lo que (4886 candidates)
505. Diminutive words (4334 candidates)
506. Simple past - irregular verbs (70365 candidates)
507. Personal pronouns (1319 candidates)
508. Muy/Mucho (29238 candidates)
509. Pretérito indefinido / Conditional present (5306 candidates)
510. Synonyms (verbs) (12479 candidates)
511. Esta - está - ésta (20266 candidates)
512. Enclisis (9885 candidates)
513. Present - Irregular verbs (2640 candidates)
514. Present - Regular verbs (8645 candidates)
515. Possessive adjectives (11700 candidates)
516. Imperative no (39275 candidates)
517. Possessive adjectives (18974 candidates)
518. Missing words (1296 candidates)
519. Personal pronouns (6735 candidates)
520. Articles (16350 candidates)