Prepositions.

[Ana laura]

Hi,
I have three sentences which contain mistakes. The mistakes are all in the preposotions and there are three types:
-missing preposition
-wrong preposition
-unnecessary preposition
The PROBLEM is that I don't find the mistakes in this sentences:
1) "we have a file of press cutting over our rivals' products"
2) "we are short by staff"
3) "consumers are found to be especially influenced by the tastes and opinions of those per their peer groups"
thanks a lot

[forum_mail]

in b) we are short OF staff... I believe,

as for the rest... gimme a while to think ;)

[Tdol]

1 on