Les tests de leopold : (78 tests en tout)
Classement par nombre de candidats
1. A lot of, Much, Many (21 486 candidats)
2. Made from, Made of, Made out of, Made with (17 129 candidats)
3. Will ou Would (16 785 candidats)
4. How much/ how long/ how often/ how well (15 617 candidats)
5. Worse ou Worst (11 876 candidats)
6. Had better ou Would rather (11 287 candidats)
7. So, Too ou Very (9 385 candidats)
8. Hate, Like, Love ou Prefer (7 761 candidats)
9. About to, bound to, due to (7 427 candidats)
10. No one, nobody, nothing, nowhere (6 616 candidats)
11. Elder, older, eldest, oldest (6 387 candidats)
12. Can, should, must, could (5 836 candidats)
13. To ou Too (4 992 candidats)
14. Différence entre In et On (4 833 candidats)
15. Below ou under (4 697 candidats)
16. Even - even if - even though (4 327 candidats)
17. No, None, Not a, Not any (4 224 candidats)
18. As if, like and as (3 647 candidats)
19. Pronoms: this, that, these et those (3 578 candidats)
20. Pronoms relatifs: who,whom,where,whose (3 517 candidats)