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

21. Order of adjectives. (3603 candidates)
22. Possession - vocabulary (3603 candidates)
23. Focus sur SHOULD/ OUGHT TO: necessity and duty. (3618 candidates)
24. Resultatives (2771 candidates)
25. Confusion : to make up for something? to catch up with someb (23 candidates) [Being reviewed]
26. Focus on MUST: an ambiguous modal auxiliary. (3843 candidates)
27. Focus on MAY: Possibility and permission. (3811 candidates)
28. Focus on CAN: incapacity and impossibility. (4392 candidates)
29. Recycling waste... - Vocabulary (2884 candidates)
30. Likely/unlikely - Willing/ unwilling (109 candidates) [Being reviewed]
31. 'Whose' and idiomatic possessive forms... (4436 candidates)
32. Preference: I'd rather go.../ I'd rather you went (5134 candidates)
33. Verbs in the -ing form, or not? (5645 candidates)
34. Verbs with two object complements (3199 candidates)
35. Vocabulary: some time/ sometime/ sometimes (4519 candidates)
36. Doubling the final consonant, or not? (5210 candidates)
37. Vocabulary: steal or rob? remember or remind? (4881 candidates)
38. Civilisation: Thanksgiving and Black Friday (2917 candidates)
39. Idioms: the weather (2769 candidates)
40. Concession (5084 candidates)