I've heard that "jugar" is the only 'u'-to-'ue' stem-changing verb. Is this true?
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Related: spanish.stackexchange.com/questions/6984 – brazofuerte May 8 '19 at 9:54
Yes.
All stem changing verbs fall into one of three categories (e→ie(→i), e→i(→i), o→ue(→u), where -ir verbs do the second change). There are exactly nine exceptions in three special categories:
- i→ie→i
adquirir, perquirir, inquirir, preadquirir - e→ie→e
cernir, concernir, decernir, discernir - u→ue
jugar
The reason for jugar being a special case is that it was originally jogar (and thus o→ue) but for some reason as the vowel shifted the stem change remained.
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Nunca había oído decernir, que veo que es lo mismo (pero en desuso) que discernir. – fedorqui 'SO stop harming' May 7 '19 at 12:20
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1@gustavovelascoh soldar es un verbo típico de alternancia o→ue, no hay nada excepcional en su conjugación. – user0721090601 May 7 '19 at 13:08
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This would make a good canonical answer -- you gave a complete run-down. I'll ask a general question -- would you mind repeating this answer there? If there's anything to add to make it complete, please do. – aparente001 May 8 '19 at 7:20