tests by laure95 with the online test builder (42 tests)
Ranked by: number of candidates
1. Could/Couldn't (308166 candidates)
2. Can/Must/Should (293931 candidates)
3. Can and can't (285020 candidates)
4. Must or mustn't (228918 candidates)
5. Like or would like (142688 candidates)
6. Should or shouldn't ? (123952 candidates)
7. Passive voice in past tense (123036 candidates)
8. Did, was or were (122369 candidates)
9. If clauses (106657 candidates)
10. Be allowed to (96901 candidates)
11. During, for or since (76580 candidates)
12. Present perfect or past perfect (68171 candidates)
13. Sentences : Like and would like (63985 candidates)
14. Infinitive proposition (43785 candidates)
15. Repeated comparative (38857 candidates)
16. Ago and past tense (34315 candidates)
17. Relative pronouns (31840 candidates)
18. This or these (26834 candidates)
19. Comparative (26104 candidates)
20. Questions and past tense (25484 candidates)