Choosing -i vs -y Plural Endings

In the masculine plural, one question decides almost everything: is the noun animate or inanimate? Animate masculine nouns — people and animals — take a "soft" nominative plural in -i that often changes the final consonant of the stem (kluk → kluci). Inanimate masculine nouns — things — take -y with no change at all (hrad → hrady). And this single split ripples outward: the adjective in front follows it (-í vs -é), and so does the verb behind it in the past tense (přišli vs stály). Learn to spot animacy, and a whole cluster of endings falls into place.

This is a place where English gives you no help whatsoever — English plurals don't care whether a noun is a person or a brick. So the instinct to "just add a plural ending" produces two classic errors: choosing the wrong vowel (-y where you need -i) and forgetting the consonant change (kluki instead of kluci). This page gives you the decision flow to get it right every time.

The core split: people/animals vs things

Grammatical animacy in Czech tracks biological animacy closely: masculine nouns denoting men, boys, and animals are animate; masculine nouns denoting objects, plants, and abstractions are inanimate. (There are a few quirky mismatches, but at B1 the people-and-animals rule covers the vast majority.) Animacy is a property of the noun you must know — it's worth learning it together with the gender. See masculine animacy for the full picture.

Animate nouns: -i, and the consonant softens

The default animate nominative plural is -i, and when the stem ends in k, h, ch, or r, that consonant mutates before the -i. This softening is not optional — leaving it out is a real error, not just an accent slip.

Many animate nouns use -ové or -é instead of plain -i (pán → pánové, učitel → učitelé, občan → občané). Don't let that distract you: -ové and -é are still animate endings, so they trigger exactly the same -í adjective and -i past tense. The deep contrast is always animate (whichever of -i / -ové / -é) versus inanimate -y.

Inanimate nouns: -y, and nothing changes

Inanimate masculine nouns take -y in the nominative plural, and the stem stays put — no softening, ever. (Soft-stem inanimates, ending in -j, -č, -ř, -c, -z, -š, -ž, take -e instead: stroj → stroje, počítač → počítače — but still no animacy-driven change.)

The adjective follows: -í for animate, -é for everything else

A masculine plural adjective splits the same way. Before an animate noun it ends in -í (and softens its own final consonant by the same rules); before an inanimate noun it ends in -é (no change). The single adjective starý shows both:

So staří muži ("old men," animate, r → ř) but staré hrady ("old castles," inanimate, plain -é). Same adjective, two endings, chosen by the noun's animacy. For the full adjective paradigm, see the masculine animate plural adjectives.

The past tense follows too

The same animacy split governs the l-participle in the past tense. A masculine animate plural subject takes -i (muži přišli); a masculine inanimate plural subject takes -y (hrady stály). And don't forget the third option that completes the system: a neuter plural subject takes -a (auta stála) — a distinct ending all its own, never merged with the -y row.

In one breath you can see all three: muži přišli (animate, -i), vlaky přijely (masc. inanimate, -y), auta stála (neuter, -a). The choice of i, y, or a on the verb is reporting the subject's gender and animacy. For the full agreement rules, see l-participle agreement.

The decision flow

Put it together as a single question you ask of every masculine plural:

1. Is the noun animate (a person or animal)?
   • Yes → noun in -i / -ové / -é, soften the final consonant if it's k/h/ch/r (kluci, Češi, doktoři); adjective in -í (mladí); past tense in -i (přišli).
   • No (a thing) → noun in -y (hard) or -e (soft), no consonant change (hrady, stroje); adjective in -é (staré); past tense in -y (stály).

Common mistakes

The transfer error is treating an animate noun like a thing and writing studenty in the subject slot. Animate masculine nouns take -i in the nominative plural; studenty is the accusative/inanimate-looking form and is wrong as a subject here.

The second classic error is adding -i but skipping the softening: kluki, Čechi, doktori. The consonant must change — kluci, Češi, doktoři. The mutation is part of the ending, not an optional extra.

In the past tense, learners often default to -y (přišly) for a male-human subject. A masculine animate plural subject takes -i: muži přišli. The -y form přišly would only fit a feminine or masculine-inanimate plural.

Don't let the animate pattern spill onto things. Hrad (castle) is inanimate, so the adjective is staré, not staří — and the noun stays hrady with no softening.

The mirror error is putting the animate -í on an inanimate noun's adjective: rychlí, tiší belong to animate nouns. For a thing like počítače, the adjectives are rychlé, tiché with -é.