174. Prepositions are words expressing some local relation, and capable of being used as prefixes in forming compound verbs. The prepositions are also used in construction with oblique cases of nouns and pronouns.
The adverbs that are construed with oblique cases, but do not enter into composition with verbs, are called improper prepositions.
The list of Homeric prepositions is the same (with perhaps one exception, see § 226) as that of later classical Greek. In the use of prepositions, however, there are some marked differences between the two periods (§ 229).
There are no "inseparable" prepositions in Greek; see however § 221.