tests by here4u with the online test builder (627 tests)

521. The use of tenses: a strange request...(1) (3636 candidates)
522. Either...or/ Neither...nor/ Not ... either. (13574 candidates)
523. There is / are, and other forms... (5137 candidates)
524. To be / to have: -ing forms... (4340 candidates)
525. Enough with the Present Perfect... (22211 candidates)
526. Whose and use (5550 candidates)
527. Else and compound words (3748 candidates)
528. What, which and all that (7099 candidates)
529. Possessive idioms (3143 candidates)
530. Possessive or genitive Case (27726 candidates)
531. Possessive adjectives and pronouns. (26027 candidates)
532. Adjectives: where to place them? (17766 candidates)
533. Adverbs: Where to place them? 2 (5119 candidates)
534. Adverbs: Where to place them? 1 (12160 candidates)
535. For/Since: second step... (4049 candidates)
536. For/Since: first step ... (7212 candidates)
537. Make someone do/ Be made to do (10807 candidates)
538. Like/to like/likely... (5012 candidates)
539. Let's get dressed... (6518 candidates)
540. Other - The others - Another (4209 candidates)