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

21. Focus on MUST: an ambiguous modal auxiliary. (3743 candidates)
22. Focus on MAY: Possibility and permission. (3729 candidates)
23. Focus on CAN: incapacity and impossibility. (4302 candidates)
24. Recycling waste... - Vocabulary (2841 candidates)
25. Likely/unlikely - Willing/ unwilling (70 candidates) [Being reviewed]
26. 'Whose' and idiomatic possessive forms... (4254 candidates)
27. Preference: I'd rather go.../ I'd rather you went (4736 candidates)
28. Verbs in the -ing form, or not? (5605 candidates)
29. Verbs with two object complements (3168 candidates)
30. Vocabulary: some time/ sometime/ sometimes (4457 candidates)
31. Doubling the final consonant, or not? (5156 candidates)
32. Vocabulary: steal or rob? remember or remind? (4850 candidates)
33. Civilisation: Thanksgiving and Black Friday (2870 candidates)
34. Idioms: the weather (2730 candidates)
35. Concession (4980 candidates)
36. Idioms: men and women (304 candidates)
37. Reduced forms (3965 candidates)
38. Modal auxiliaries in the past. (4932 candidates)
39. To see and to hear + ing/ bare infinitive (6403 candidates)
40. Word Stress (2) (2371 candidates)