l, jedla, jedlo||vedel, vedela, vedelo|
Adverbs are formed by replacing the adjectival ending with the ending -o or -e / -y. Sometimes both -o and -e are possible. Examples include the following:
The comparative of adverbs is formed by replacing the adjectival ending with a comparative/superlative ending -(ej)ší or -(ej)šie, whence the superlative is formed with the prefix naj-. Examples include the following:
Each preposition is associated with one or more grammatical cases. The noun governed by a preposition must agree with the preposition in the given context. The preposition od always calls for the genitive case, but some prepositions such as po can call for different cases depending on the intended sense of the preposition.
Main article: History of the Slovak language
Slovak is a descendant of Proto-Slavic, itself a descendant of Proto-Indo-European. It is closely related to the other West Slavic languages, primarily to Czech and Polish. Czech also influenced the language in its later development. The highest number of borrowings in the old Slovak vocabulary come from Latin, German, Czech, Hungarian, Polish and Greek (in that order). Recently, it is also influenced by English.
Although most dialects of Czech and Slovak are mutually intelligible (see Comparison of Slovak and Czech), eastern Slovak dialects are less intelligible to speakers of Czech and closer to Polish and East Slavic, and contact between speakers of Czech and speakers of the eastern dialects is limited.
Since the dissolution of Czechoslovakia it has been permitted to use Czech in TV broadcasting and during court proceedings (Administration Procedure Act 99/1963 Zb.). From 1999 to August 2009, the Minority Language Act 184/1999 Z.z., in its section (§) 6, contained the variously interpreted unclear provision saying that "When applying this act, it holds that the use of the Czech language fulfills the requirement of fundamental intelligibility with the state language"; the state language is Slovak and the Minority Language Act basically refers to municipalities with more than 20% ethnic minority population (no such Czech municipalities are found in Slovakia). Since 1 September 2009 (due to an amendment to the State Language Act 270/1995 Z.z.) a language "fundamentally intelligible with the state language" (i.e. the Czech language) may be used in contact with state offices and bodies by its native speakers, and documents written in it and issued by bodies in the Czech Republic are officially accepted. Regardless of its official status, Czech is used commonly both in Slovak mass media and in daily communication by Czech natives as an equal language.
Czech and Slovak have a long history of interaction and mutual influence well before the creation of Czechoslovakia in 1918, a state which existed until 1993. Literary Slovak shares significant orthographic features with Czech, as well as technical and professional terminology dating from the Czechoslovak period, but phonetic, grammatical, and vocabulary differences do exist.
Slavic language varieties are relatively closely related, and have had a large degree of mutual influence, due to the complicated ethnopolitical history of their historic ranges. This is reflected in the many features Slovak shares with neighboring language varieties. Standard Slovak shares high degrees of mutual intelligibility with many Slavic varieties. Despite this closeness to other Slavic varieties, significant variation exists among Slovak dialects. In particular, eastern varieties differ significantly from the standard language, which is based on central and western varieties.
Eastern Slovak dialects have the greatest degree of mutual intelligibility with Polish of all the Slovak dialects, followed by Rusyn, but both Eastern Slovak and Rusyn lack familiar technical terminology and upper register expressions. Polish and Sorbian also differ quite considerably from Czech and Slovak in upper registers, but non-technical and lower register speech is readily intelligible. Some mutual intelligibility occurs with spoken Rusyn, Ukrainian