Simple prepositions can subdivided into:
Proper:
| type=prep, form=simple | |||
| D e s c r i p t i o n | E x a m p l e s | ||
| Simple Prep. | di/prep , a/prep , da/prep , in/prep , | ||
| con/prep , su/prep , per/prep , fra/prep | |||
Not-proper:
The improper prepositions listed above cause the most frequent confusion phenomena between categories.