Rihan has both prepositions and postpositions. Prepositions go before the substantive phrase (the noun phrase) they modify, while postpositions follow it. Most of these stand alone, but a few affix themselves to the noun in the substantive phrase. The following is a list of the most common prepositions and postpositions and the cases they govern.
Key: (NA) Nominative-Accusative, (G) Genitive, (D) Dative
Prepositions
| according to | mh'hoær nnea (+G) |
| after (temporal) | aihkh (+NA) |
| after (local) | rheh (+G) |
| against | nelle, thaihnhas (+D) |
| around | hræfva (+D) |
| (to) around | hræfva (+NA) |
| about | sevihf (+D) |
| (to) about | sevihf (+NA) |
| as far as | ru (+NA) |
| at | hrrau, h'rau (+D) |
| (to) at | hrrau, h'rau (+NA) |
| away from | uænn (+G) |
| because of | kivoi (+G) |
| before | hra'nuar (+D) |
| (to) before | hra'nuar (+NA) |
| below | ihfvi (+D) |
| (to) below | ihfvi (+NA) |
| between | æthl (+D) |
| (to) between | æthl (+NA) |
| by | mh'- (+G, prefixed) |
| down | iut'fehill (+NA) |
| during | fv'r'astev (+G) |
| far from | irha (+G) |
| for (for someone, e.g.) | ssiun (+D) |
| for (to, towards) | ssiun (+NA) |
| for (time for a change, e.g.) | vr'- (+D, prefixed) |
| from | mh'- (+G, prefixed) |
| in front (of) | hra'nuar (+D) |
| (to) in front (of) | hra'nuar (+NA) |
| in | hrrau, h'rau (+D) |
| inside | hrrafv (+D) |
| (to) inside | hrrafv (+NA) |
| instead of | hrrauta (+G) |
| into | hrao, hrrafv (+NA) |
| lead by, under command of | hir'- (+G, prefixed) |
| near | ædt (+D) |
| (to) near | ædt (+NA) |
| next to | hhæh-ahi (+D) |
| (to) next to | hhæh-ahi (+NA); |
| of (eg. made of) | nnea (+G) |
| on | hrrau, h'rau (+D) |
| onto | hrrau, h'rau (+NA) |
| out | nnu (+NA) |
| out of | mhirrafv (+G) |
| outside | mhirrafv (+D) |
| (to) outside | mhirrafv (+NA) |
| over | fvi (+D) |
| (to) over | fvi (+NA) |
| past | siur (+G) |
| regarding | haje (+G) |
| to | i (+NA) |
| to (until, as far as) | ru (+NA) |
| to, towards | ssiun (+NA) |
| to (receiving the action) | ih (+D) |
| under | ihfvi (+D) |
| (to) under | ihfvi (+NA) |
| until (a place) | ru (+NA) |
| with | sa'- (+G, prefixed) |
| without | lli (+G) |
Postpositions
| atop, on top, upon | (D+) mibh |
| (to) atop/on top/upon | (NA+) mibh |
| from | (G+, suffixed) -hel, -el |
| in (temporal, e.g. in 5 hours) | (NA+) dha |
| through | (NA+) hsah |
| until, up to (a time) | (G+) iut |
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