tests by here4u with the online test builder (683 tests)

21. Focus on MUST: an ambiguous modal auxiliary. (3734 candidates)
22. Focus on MAY: Possibility and permission. (3717 candidates)
23. Focus on CAN: incapacity and impossibility. (4296 candidates)
24. Recycling waste... - Vocabulary (2841 candidates)
25. Likely/unlikely - Willing/ unwilling (70 candidates) [Being reviewed]
26. 'Whose' and idiomatic possessive forms... (4243 candidates)
27. Preference: I'd rather go.../ I'd rather you went (4735 candidates)
28. Verbs in the -ing form, or not? (5602 candidates)
29. Verbs with two object complements (3167 candidates)
30. Vocabulary: some time/ sometime/ sometimes (4457 candidates)
31. Doubling the final consonant, or not? (5155 candidates)
32. Vocabulary: steal or rob? remember or remind? (4844 candidates)
33. Civilisation: Thanksgiving and Black Friday (2867 candidates)
34. Idioms: the weather (2729 candidates)
35. Concession (4977 candidates)
36. Idioms: men and women (301 candidates)
37. Reduced forms (3965 candidates)
38. Modal auxiliaries in the past. (4927 candidates)
39. To see and to hear + ing/ bare infinitive (6398 candidates)
40. Word Stress (2) (2368 candidates)