Les tests de leopold : (78 tests en tout)
Classement par nombre de candidats
1. A lot of, Much, Many (21 464 candidats)
2. Made from, Made of, Made out of, Made with (16 849 candidats)
3. Will ou Would (16 692 candidats)
4. How much/ how long/ how often/ how well (15 440 candidats)
5. Worse ou Worst (11 810 candidats)
6. Had better ou Would rather (11 244 candidats)
7. So, Too ou Very (9 273 candidats)
8. Hate, Like, Love ou Prefer (7 692 candidats)
9. About to, bound to, due to (7 298 candidats)
10. No one, nobody, nothing, nowhere (6 574 candidats)
11. Elder, older, eldest, oldest (6 349 candidats)
12. Can, should, must, could (5 760 candidats)
13. To ou Too (4 811 candidats)
14. Différence entre In et On (4 779 candidats)
15. Below ou under (4 636 candidats)
16. Even - even if - even though (4 284 candidats)
17. No, None, Not a, Not any (4 169 candidats)
18. As if, like and as (3 617 candidats)
19. Pronoms: this, that, these et those (3 567 candidats)
20. Pronoms relatifs: who,whom,where,whose (3 491 candidats)