tests by here4u with the online test builder (628 tests)

501. Vocabulary: Swimming, diving... (2709 candidates)
502. Who - What - Which (24316 candidates)
503. Infinitive implied by its particle. (3360 candidates)
504. Doing, Do, To do... (9346 candidates)
505. Choosing your past tense... (47763 candidates)
506. Tenses : satisfying the request... (2) (2121 candidates)
507. The use of tenses: a strange request...(1) (3615 candidates)
508. Either...or/ Neither...nor/ Not ... either. (13441 candidates)
509. There is / are, and other forms... (5058 candidates)
510. To be / to have: -ing forms... (4292 candidates)
511. Enough with the Present Perfect... (21768 candidates)
512. Whose and use (5439 candidates)
513. Else and compound words (3723 candidates)
514. What, which and all that (6996 candidates)
515. Possessive idioms (3101 candidates)
516. Possessive or genitive Case (27575 candidates)
517. Possessive adjectives and pronouns. (25708 candidates)
518. Adjectives: where to place them? (17662 candidates)
519. Adverbs: Where to place them? 2 (5063 candidates)
520. Adverbs: Where to place them? 1 (12018 candidates)