tests by laure95 with the online test builder (42 tests)
Ranked by: number of candidates
1. Could/Couldn't (307985 candidates)
2. Can/Must/Should (293536 candidates)
3. Can and can't (284573 candidates)
4. Must or mustn't (228494 candidates)
5. Like or would like (142558 candidates)
6. Should or shouldn't ? (123594 candidates)
7. Passive voice in past tense (122939 candidates)
8. Did, was or were (122131 candidates)
9. If clauses (106596 candidates)
10. Be allowed to (96654 candidates)
11. During, for or since (76444 candidates)
12. Present perfect or past perfect (67961 candidates)
13. Sentences : Like and would like (63880 candidates)
14. Infinitive proposition (43680 candidates)
15. Repeated comparative (38793 candidates)
16. Ago and past tense (34292 candidates)
17. Relative pronouns (31768 candidates)
18. This or these (26778 candidates)
19. Comparative (26102 candidates)
20. Questions and past tense (25378 candidates)