Les tests de leopold : (78 tests en tout)
Classement par nombre de candidats
1. A lot of, Much, Many (21 489 candidats)
2. Made from, Made of, Made out of, Made with (17 170 candidats)
3. Will ou Would (16 791 candidats)
4. How much/ how long/ how often/ how well (15 658 candidats)
5. Worse ou Worst (11 892 candidats)
6. Had better ou Would rather (11 291 candidats)
7. So, Too ou Very (9 394 candidats)
8. Hate, Like, Love ou Prefer (7 779 candidats)
9. About to, bound to, due to (7 451 candidats)
10. No one, nobody, nothing, nowhere (6 619 candidats)
11. Elder, older, eldest, oldest (6 400 candidats)
12. Can, should, must, could (5 870 candidats)
13. To ou Too (4 998 candidats)
14. Différence entre In et On (4 839 candidats)
15. Below ou under (4 701 candidats)
16. Even - even if - even though (4 367 candidats)
17. No, None, Not a, Not any (4 226 candidats)
18. As if, like and as (3 661 candidats)
19. Pronoms: this, that, these et those (3 585 candidats)
20. Pronoms relatifs: who,whom,where,whose (3 528 candidats)