Russian has a number of adjectives formed from other types of words, for examples, nouns. Where English might use a noun chain or a few nouns stitched together ("summer shirt", "homework"), we often use an adjective—of course, if the language has one («летняя рубашка», «домашняя работа»).
Here is the full table:
ENDINGS | m | n | f | pl |
---|---|---|---|---|
Nom. | -ый(о́й)/ ‑ий | -ое/ ‑ее | ‑ая/ ‑яя | -ые/-ие |
Acc. | Nom. or Gen. | -ое/ ‑ее | -ую/ ‑юю | Nom. or Gen. |
Gen. | -ого/‑его | see m. | -ой/-ей | -ых/-их |
Prep. | -ом/-ем | see m. | -ой/-ей | -ых/-их |
Dat. | ‑ому/‑ему | see m. | -ой/-ей | -ым/-им |
Instr. | -ым/-им | see m. | -ой/-ей | ‑ыми/ ‑ими |
«Знакомый» is a word for "familiar", also widely used as a noun for "pal, acquaintance" (знакомый for males, знакомая for females)