tests by here4u with the online test builder (669 tests)

21. Concession (4740 candidates)
22. Idioms: men and women (276 candidates)
23. Reduced forms (3859 candidates)
24. Modal auxiliaries in the past. (4598 candidates)
25. To see and to hear + ing/ bare infinitive (6259 candidates)
26. Word Stress (2) (25 candidates) [Being reviewed]
27. Word Stress (1) (53 candidates) [Being reviewed]
28. Pronunciation of the final sound -ED (3823 candidates)
29. A few difficulties with pronunciation (3222 candidates)
30. Vocabulary: doing things... (4105 candidates)
31. Vocabulary: Taking a holiday (4280 candidates)
32. Can/ could/ can't and equivalents (1012 candidates)
33. By? By the time? Until? (5975 candidates)
34. Made of? from? with? or out of? (6020 candidates)
35. Standard or casual registers? (28 candidates) [Being reviewed]
36. Conditions (2329 candidates)
37. Vocabulary: belonging and possessing (388 candidates)
38. Subject-verb inversions (3943 candidates)
39. Word order: no subject - verb inversion (609 candidates)
40. To be to? or To have to? (802 candidates)