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

21. Likely/unlikely - Willing/ unwilling (54 candidates) [Being reviewed]
22. 'Whose' and idiomatic possessive forms... (4061 candidates)
23. Preference: I'd rather go.../ I'd rather you went (4686 candidates)
24. Verbs in the -ing form, or not? (5567 candidates)
25. Verbs with two object complements (3142 candidates)
26. Vocabulary: some time/ sometime/ sometimes (4427 candidates)
27. Doubling the final consonant, or not? (5109 candidates)
28. Vocabulary: steal or rob? remember or remind? (4806 candidates)
29. Civilisation: Thanksgiving and Black Friday (2817 candidates)
30. Idioms: the weather (2718 candidates)
31. Concession (4894 candidates)
32. Idioms: men and women (301 candidates)
33. Reduced forms (3923 candidates)
34. Modal auxiliaries in the past. (4748 candidates)
35. To see and to hear + ing/ bare infinitive (6345 candidates)
36. Word Stress (2) (2299 candidates)
37. Word Stress (1) (2825 candidates)
38. Pronunciation of the final sound -ED (3967 candidates)
39. A few difficulties with pronunciation (3307 candidates)
40. Vocabulary: doing things... (4165 candidates)