32. The cook ought to have prepared it
33. It is your duty to do this work
....
34. Someone saw him pick up the gun.
35. Nobody has used this motor for a long time.
36. I think I should tell everybody about it.
37. You need not type this letter.
38. They began to build the house last year.
39. People speak English all over the world.
40. They sell jeans all over the world.