tests by laure95 with the online test builder (42 tests)
Ranked by: number of candidates
1. Could/Couldn't (308491 candidates)
2. Can/Must/Should (294167 candidates)
3. Can and can't (285477 candidates)
4. Must or mustn't (229139 candidates)
5. Like or would like (142745 candidates)
6. Should or shouldn't ? (124149 candidates)
7. Passive voice in past tense (123107 candidates)
8. Did, was or were (122492 candidates)
9. If clauses (106717 candidates)
10. Be allowed to (97002 candidates)
11. During, for or since (76739 candidates)
12. Present perfect or past perfect (68323 candidates)
13. Sentences : Like and would like (64014 candidates)
14. Infinitive proposition (43890 candidates)
15. Repeated comparative (38952 candidates)
16. Ago and past tense (34343 candidates)
17. Relative pronouns (31902 candidates)
18. This or these (26975 candidates)
19. Comparative (26112 candidates)
20. Questions and past tense (25551 candidates)