Les tests de leopold : (78 tests en tout)
Classement par nombre de candidats
1. A lot of, Much, Many (21 468 candidats)
2. Made from, Made of, Made out of, Made with (16 901 candidats)
3. Will ou Would (16 713 candidats)
4. How much/ how long/ how often/ how well (15 472 candidats)
5. Worse ou Worst (11 819 candidats)
6. Had better ou Would rather (11 251 candidats)
7. So, Too ou Very (9 308 candidats)
8. Hate, Like, Love ou Prefer (7 711 candidats)
9. About to, bound to, due to (7 327 candidats)
10. No one, nobody, nothing, nowhere (6 579 candidats)
11. Elder, older, eldest, oldest (6 356 candidats)
12. Can, should, must, could (5 774 candidats)
13. To ou Too (4 821 candidats)
14. Différence entre In et On (4 804 candidats)
15. Below ou under (4 645 candidats)
16. Even - even if - even though (4 290 candidats)
17. No, None, Not a, Not any (4 170 candidats)
18. As if, like and as (3 621 candidats)
19. Pronoms: this, that, these et those (3 574 candidats)
20. Pronoms relatifs: who,whom,where,whose (3 507 candidats)