Les tests de leopold : (78 tests en tout)
Classement par nombre de candidats
1. A lot of, Much, Many (21 461 candidats)
2. Made from, Made of, Made out of, Made with (16 825 candidats)
3. Will ou Would (16 669 candidats)
4. How much/ how long/ how often/ how well (15 404 candidats)
5. Worse ou Worst (11 788 candidats)
6. Had better ou Would rather (11 231 candidats)
7. So, Too ou Very (9 265 candidats)
8. Hate, Like, Love ou Prefer (7 668 candidats)
9. About to, bound to, due to (7 274 candidats)
10. No one, nobody, nothing, nowhere (6 557 candidats)
11. Elder, older, eldest, oldest (6 334 candidats)
12. Can, should, must, could (5 739 candidats)
13. To ou Too (4 805 candidats)
14. Différence entre In et On (4 771 candidats)
15. Below ou under (4 631 candidats)
16. Even - even if - even though (4 264 candidats)
17. No, None, Not a, Not any (4 166 candidats)
18. As if, like and as (3 603 candidats)
19. Pronoms: this, that, these et those (3 563 candidats)
20. Pronoms relatifs: who,whom,where,whose (3 471 candidats)