tests by here4u with the online test builder (650 tests)

521. Choosing your past tense... (49151 candidates)
522. Tenses : satisfying the request... (2) (2299 candidates)
523. The use of tenses: a strange request...(1) (3647 candidates)
524. Either...or/ Neither...nor/ Not ... either. (13655 candidates)
525. There is / are, and other forms... (5155 candidates)
526. To be / to have: -ing forms... (4353 candidates)
527. Enough with the Present Perfect... (22343 candidates)
528. Whose and use (5575 candidates)
529. Else and compound words (3785 candidates)
530. What, which and all that (7132 candidates)
531. Possessive idioms (3147 candidates)
532. Possessive or genitive Case (27868 candidates)
533. Possessive adjectives and pronouns. (26080 candidates)
534. Adjectives: where to place them? (17774 candidates)
535. Adverbs: Where to place them? 2 (5133 candidates)
536. Adverbs: Where to place them? 1 (12186 candidates)
537. For/Since: second step... (4148 candidates)
538. For/Since: first step ... (7351 candidates)
539. Make someone do/ Be made to do (10841 candidates)
540. Like/to like/likely... (5018 candidates)