tests by laure95 with the online test builder (42 tests)
Ranked by: number of candidates
1. Could/Couldn't (306340 candidates)
2. Can/Must/Should (290518 candidates)
3. Can and can't (282213 candidates)
4. Must or mustn't (226161 candidates)
5. Like or would like (142253 candidates)
6. Should or shouldn't ? (122707 candidates)
7. Passive voice in past tense (121124 candidates)
8. Did, was or were (120860 candidates)
9. If clauses (105954 candidates)
10. Be allowed to (96063 candidates)
11. During, for or since (76098 candidates)
12. Present perfect or past perfect (67241 candidates)
13. Sentences : Like and would like (63561 candidates)
14. Infinitive proposition (42939 candidates)
15. Repeated comparative (38235 candidates)
16. Ago and past tense (34099 candidates)
17. Relative pronouns (31194 candidates)
18. This or these (26678 candidates)
19. Comparative (26036 candidates)
20. Questions and past tense (25071 candidates)