(as in , "you are"). The 14th and 15th centuries saw an evolution of these conjugations, with originally giving , giving (or ), giving , and giving . Soon analogous forms and appeared. Hence the variety of forms the contemporary American adopts, some varieties featuring a generalized monophthong (most of them), some a generalized diphthong (e.g. Venezuela), and some combining monophthongs and diphthongs, depending on the conjugation (e.g. Chile). In the most general, monophthongized, conjugation paradigm, a difference between forms and respective forms is visible exclusively in the present indicative, imperative and subjunctive, and, most of the time, in the preterite. Below is a comparison table of the conjugation of several verbs for and for , and next to them the one for , the informal second person plural currently used orally only in Spain; in oratory or legal language (highly formal forms of Spanish) it is used outside of Spain. Verb forms that agree with are stressed on the last syllable, causing the loss of the stem diphthong in those verbs, such as and , which are stem-changing. General conjugation is the one that is most widely accepted and used in various countries such as Argentina, Uruguay, Paraguay, parts of Bolivia, Ecuador, and Colombia, as well as Central American countries. Some Uruguayan speakers combine the pronoun tú with the vos conjugation (for example, tú sabés). Conversely, speakers in some other places where both tú and vos are used combine vos with the tú conjugation (for example, vos sabes). This is a frequent occurrence in the Argentine province of Santiago del Estero. The verb forms employed with vos are also different in Chilean Spanish: Chileans use and 'you are' instead of or and or . Chileans never pronounce these conjugations with a final -s. The forms for 'you are', and and for 'you have' are also found in Chilean Spanish. In the case of the ending -ís (such as in comís, podís, vivís, erís, venís), the final -s is pronounced like any other final in Chilean Spanish. It is most often pronounced as an aspiration similar to the 'h' sound in English. It can also be pronounced as a fricative , or be dropped completely. Its variable pronunciation is a phonological rather than a morphological phenomenon. Venezuelan Maracucho Spanish is notable in that they preserve the diphthongized plural verb forms in all tenses, as still used with vosotros in Spain.