ADQUIRIR (TO ACQUIRE)
The infinitive was once adquerir, hence -ie- when the stem vowel is stressed.  Bracketed forms are regular, as are all forms not shown e.g. adquirí, adquiría, adquiriré, adquiriera, etc.
Imperative:	(tú) adquiere, (usted) adquiera, (ustedes) adquieran
Present indicative:	adquiero, adquieres, adquiere, (adquirimos), (adquiramos), adquieren
Present subjunctive:	adquiera, adquieras, adquiera, (adquiramos), (adquirás), adquieran