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The following chart shows a complete list of the consonant phonemes of Czech:
1 The phoneme , written ⟨?⟩, is a raised alveolar non-sonorant trill. Its rarity makes it difficult to produce for foreign learners of Czech, who may pronounce it as [r?]; however, it contrasts with /r?/ in words like r?át [r?a:t] ('to neigh'), which is pronounced differently from ?ád [r?a:t] ('order'). The basic realization of this phoneme is voiced, but it is voiceless [r] when preceded or followed by a voiceless consonant or at the end of a word.
/t/ and /d/ can be pronounced as dental stops.
The voiceless realization of the phoneme /?/ is velar [x].
The glottal stop is not a separate phoneme. Its use is optional and it may appear as the onset of an otherwise vowel-initial syllable. The pronunciation with or without the glottal stop does not affect the meaning and is not distinctive.
The glottal stop has two functions in Czech:
In the standard pronunciation, the glottal stop is never inserted between two vowels in words of foreign origin, e.g. in the word koala.
The phonemes /f/, /g/, /d/ and /d?z/ usually occur in words of foreign origin or dialects only. As for /f/, however, the number of words where it occurs is still significant and many of them are commonplace, e.g. fialový ('violet'), fronta ('queue' as a noun), fotit ('take photos'), doufat ('hope' as a verb). It is also used in common first names (Franti?ek, Filip) and surnames (Fiala, Fi?er). The phoneme /g/, though rarer than /f/, appears in frequently used words as well, e.g. graf ('graph'), gram ('gram'), grep ('grapefruit'), regulace ('regulation'). The occurrence of /d/ is uncommon and typically signals that the word is of English origin (e.g. d?íny d?bán /d?z/ is quite marginal, used mostly by dialects spoken near the border with Slovakia (see Slovak phonology).
Nevertheless, as phonemic realizations [f], [g], [d] and [d?z] all four consonants also occur as allophones of /v/, /k/, /t/ and /t?s/ respectively due to assimilation of voice. Moreover, affricates can phonetically occur at morpheme boundaries (see consonant merging below).
Other consonants are represented by the same characters (letters) as in the IPA.
Realizations of consonant phonemes are influenced by their surroundings. The position of phonemes in words can modify their phonetic realizations without a change of the meaning.
The former assimilation is optional while the latter is obligatory. Realization of the former as [tramvaj] is thus possible, especially in more prestigious registers, whereas realization of the latter as [banka] is considered hypercorrect, and hence incorrect.
Assimilation of voice is an important feature of Czech pronunciation. Voiced obstruents are, in certain circumstances, realized voiceless and vice versa. It is not represented in orthography, where more etymological principles are applied. Assimilation of voice applies in these circumstances:
Voiced and voiceless obstruents form pairs in which the assimilation of voice applies (see table):
Sonorants (/m/, /n/, /?/, /j/, /r/ and /l/) have no voiceless counterparts and are never devoiced. They do not cause the voicing of voiceless consonants in standard pronunciation, e.g. sledovat [sl?dovat] ('to watch').
There are some exceptions to the rules described above:
Two identical consonant phonemes (or allophones) can meet in morpheme boundaries during word formation. In many cases, especially in suffixes, two identical consonant sounds merge into one sound in pronunciation, e.g. cenný ('valuable'), m?kký ('soft').
In prefixes and composite words, lengthened or doubled pronunciation (gemination) is obvious. It is necessary in cases of different words: nejjasn?j?í [n?jjasj?i:] ('the clearest') vs. nejasn?j?í [n?jasj?i:] ('more unclear'). Doubled pronunciation is perceived as hypercorrect in cases like [t?s?nni:] or [mkki:].
Combinations of stops (/d/, /t/, /?/, /c/) and fricatives (/s/, /z/, /?/, /?/) usually produce affricates ([t?s, d?z, t, d]): d?tský [t?ski:] ('children's'). Both phonemes are pronounced separately in careful pronunciation: [t.ski:].
There are 10 monophthongal and 3 diphthongal vowel phonemes in Czech: /i ? a: a o: o u: u eu? au? ou?/. Czech is a quantity language: it differentiates five vowel qualities that occur as both phonologically short and long. The short and long counterparts generally do not differ in their quality, although long vowels may be more peripheral than short vowels.
As for the high front vowel pair /i:/-/i/, there are dialectal differences with respect to phonetic realisation of the contrast: in the Bohemian variety of Czech, the two vowels are differentiated by both quality and duration, while in the Eastern Moravian variety of Czech the primary difference is that of duration. Therefore, in the Bohemian variety, the transcription [i:]-[?] more accurately reflects the trade off between the qualitative and the durational difference in these vowels, while in the Eastern Moravian variety of Czech, the transcription [i:]-[i] captures the primary durational difference.
Vowel length and quality is independent of the stress.
The phonemes /o/ and /o:/ are sometimes transcribed /?/ and /?:/. This transcription describes the pronunciation in Central Bohemia and Prague, which is more open. The standard pronunciation is something between [o(:)] and [?(:)], i.e. mid back vowel.
The letter ? is not a separate vowel. It denotes /?/ after a palatal stop or palatal nasal (e.g. n?co /tso/), // after /m/ (e.g. m?kký /mki:/), and /j?/ after other labial consonants (e.g. b?s /bj?s/).
The vowel sequences ia, ie, ii, io, and iu in foreign words are not diphthongs. They are pronounced with an epenthetic /j/ between the vowels: [?ja, ?j?, ?j?, ?jo, ?ju].
The stress is nearly always fixed to the first syllable of a word. Exceptions:
Long words can have the secondary stress which is mostly placed on every odd syllable, e.g. 'nej.krás.?n?j.?í ('the most beautiful'). However, in some cases it can be placed on the fourth syllable, e.g. 'nej.ze.le.?n?j.?í ('the greenest').
The stress has no lexical or phonological function; it denotes boundaries between words but does not distinguish word meanings. It has also no influence on the quality or quantity of vowels, i.e. the vowels are not reduced in unstressed syllables and can be both short and long regardless of the stress. Thus, the Czech rhythm can be considered as isosyllabic.
Czech is not a tonal language. Tones or melodies are not lexical distinctive features. However, intonation is a distinctive feature on the level of sentences. Tone can differentiate questions from simple messages, as it need not necessarily be indicated by the word order:
All these sentences have the same lexical and grammatical structure. The differences are in their intonation.
Open syllables of type CV are the most abundant in Czech texts. It is supposed that all syllables were open in the Proto-Slavic language. Syllables without consonant onset occur with a relatively little frequency. The usage of the glottal stop as an onset in such syllables confirms this tendency in the pronunciation of Bohemian speakers. In Common Czech, the most widespread Czech interdialect, prothetic v- is added to all words beginning with o- in standard Czech, e.g. voko instead of oko (eye).
The general structure of Czech syllables is:
Thus, Czech word can have up to five consonants in the initial group (e.g. vzkv?t) and three consonants in the final group (not including syllabic consonants). The syllabic nucleus is usually formed by vowels or diphthongs, but in some cases syllabic sonorants (/r/ and /l/, rarely also /m/ and /n/) can be found in the nucleus, e.g. vlk [vl?k] ('wolf'), krk [kr?k] ('neck'), osm [osm?] ('eight').
Vowel groups can occur in the morpheme boundaries. They cannot include more than two vowels. Both vowels in the groups are separate syllabic nuclei and do not form diphthongs.
Phoneme alternations in morphophonemes (changes which do not affect morpheme meaning) are frequently applied in inflections and derivations. They are divided into vowel and consonant alternations. Both types can be combined in a single morpheme:
The most important alternations are those of short and long phonemes. Some of these alternations are correlative, i.e. the phonemes in pairs differ in their length only. Due to historical changes in some phonemes (/o:/ -> /u:/, /u:/ -> /ou?/, similar to the Great Vowel Shift in English), some alternations are disjunctive, i.e. the phonemes in pairs are different in more features. These alternations occur in word roots during inflections and derivations, and they also affect prefixes in derivations.
|Short phoneme||Long phoneme||Examples, notes|
|/a/||/a:/||zakladatel ('founder') - zakládat ('to found')|
|/?/||/?:/||letadlo ('airplane') - létat ('to fly')|
|/?/||/i:/||litovat ('to be sorry') - lítost ('regret')|
vykonat ('to perform') - výkon ('performance')
|/o/||/u:/||kon? ('horses') - k?? ('horse')|
|/u/||/u:/||u?esat ('to comb') - ú?es ('hair style') |
(in initial positions in morphemes only)
|/ou?/||kup! ('buy!') - koupit ('to buy')|
(in other positions)
Some other disjunctive vowel alternations occur in word roots during derivations (rarely also during inflections):
Emergence/disappearance alternations also take place, i.e. vowels alternate with null phonemes. In some allomorphs, /?/ is inserted between consonants in order to make the pronunciation easier:
It also occurs in some prepositions which have vocalised positional variants: v dom? - ('in a house') - ve vod? ('in water'); s tebou ('with you') - se mnou ('with me'), etc.
Some other alternations of this type occur, but they are not so frequent:
Alternations of hard and soft consonants represent the most abundant type. They occur regularly in word-stem final consonants before certain suffixes (in derivations) and endings (in inflections). Hard consonants are softened if followed by soft /?/ (written ⟨e/?⟩), /?/, or /i:/ (written ⟨i⟩ and ⟨í⟩, not ⟨y⟩ and ⟨ý⟩). These changes also occur before some other suffixes (e.g. -ka). Softening can be both correlative and disjunctive.
|/d/||/?/||mladý (young - masc. sg.) - mladí ('young' masc. anim. pl.)|
|/t/||/c/||plat ('wages') - platit ('to pay')|
|/n/||/?/||?ena ('woman') - ?en?' ('woman' dat.)|
|/r/||/r/||dobrý ('good') - dob?e ('well')|
|/s/||/?/||u?esat ('to comb') - u?e?u ('I will comb')|
|/z/||/?/||ukázat (to show) - uká?u (I will show)|
|/t?s/||/t/||ovce ('sheep') - ov?ák ('shepherd')|
|/?/||/?/||Riga ('Riga') - ri?ský ('from Riga')|
|/z/||v Rize ('in Riga')|
|/?/||/?/||Praha ('Prague') - Pra?an ('Prague citizen')|
|/z/||v Praze ('in Prague')|
|/x/||/?/||prach ('dust') - prá?it ('to raise dust')|
|/s/||smíchat ('to mix') - sm?s ('mixture')|
|/k/||/t/||vlk ('wolf') - vl?ek ('little wolf')|
|/sk/||/?c/||britský ('British' - masc. sg.) - brit?tí ('British' - masc. anim. pl.)|
|/t?sk/||/tc/||anglický ('English') - angli?tina ('English language')|
|/b/||/bj/||nádoba ('vessel') - v nádob? ('in a vessel')|
bílý ('white') - b?lásek ('cabbage white butterfly')
|/p/||/pj/||zpívat ('to sing') - zp?vák ('singer')|
|/v/||/vj/||tráva ('grass') - na tráv? ('on the grass')|
vím ('I know') - v?d?t ('to know')
|/f/||/fj/||harfa ('harp') - na harf? ('on the harp')|
|/m/||/m?/||d?m ('house') - v dom? ('in a house')|
smích ('laughter') - smný ('laughable')
The last five examples are emergence alternations. A phoneme (/j/ or /?/) is inserted in the pronunciation, but for the historical reasons, these changes are indicated by ⟨?⟩ in the orthography (see the orthographic notes below). These alternations are analogical with softening alternations, therefore they are mentioned here. They also occur in word roots together with vowel alternations (usually |?/i:|).
Some other alternations occur but they are not so frequent. They are often little evident:
In some letter groups, phonological principles of the Czech orthography are broken:
|Voiced plosive||Voiceless plosive||Nasal|
|dy [d?]||ty [t?]||ny [n?]|
|dý [di:]||tý [ti:]||ný [ni:]|
|di ||ti [c?]||ni |
|dí [?i:]||tí [ci:]||ní [?i:]|
|d? ||t? [c?]||n? |
/'s?v?ra:k a 'slunt?s? s? '?a:dal? | ?do 'z ?ix j? 's?lj?i:/
['s?v?ra:k a 's?unt?s? s? '?a:da | ?do 'z ?ix j? 's?j?i:]
Severák a Slunce se hádali, kdo z nich je siln?j?í.