tests by here4u with the online test builder (670 tests)

521. Doing, Do, To do... (9545 candidates)
522. Choosing your past tense... (49227 candidates)
523. Tenses : satisfying the request... (2) (2303 candidates)
524. The use of tenses: a strange request...(1) (3650 candidates)
525. Either...or/ Neither...nor/ Not ... either. (13670 candidates)
526. There is / are, and other forms... (5208 candidates)
527. To be / to have: -ing forms... (4357 candidates)
528. Enough with the Present Perfect... (22359 candidates)
529. Whose and use (5590 candidates)
530. Else and compound words (3798 candidates)
531. What, which and all that (7140 candidates)
532. Possessive idioms (3149 candidates)
533. Possessive or genitive Case (27885 candidates)
534. Possessive adjectives and pronouns. (26089 candidates)
535. Adjectives: where to place them? (17795 candidates)
536. Adverbs: Where to place them? 2 (5139 candidates)
537. Adverbs: Where to place them? 1 (12201 candidates)
538. For/Since: second step... (4187 candidates)
539. For/Since: first step ... (7368 candidates)
540. Make someone do/ Be made to do (10850 candidates)