Utilizar to use, to utilize                                                                                                     IRREGULAR VERB
Indicative tenses
 Pronoun             Present         Preterite          Imperfect                Future              Conditional
 Yo                  utilizo         utilicé            utilizaba                utilizaré           utilizaría
 I                   I use           I used             I used to use            I will use          I would use
 Tú                  utilizas        utilizaste         utilizabas               utilizarás          utilizarías
 You                 you use         you used           you used to use          you will use        you would use
 Ella / Él / Ud      utiliza         utilizó            utilizaba                utilizará           utilizaría
 She/he/you (fml)    s/he uses       s/he used          s/he used to use         s/he will use       s/he would use
 Nosotras/os         utilizamos      utilizamos         utilizábamos             utilizaremos        utilizaríamos
 We                  we use          we used            we used to use           we will use         we would use
 Vosotras/os         utilizáis       utilizasteis       utilizabais              utilizaréis         utilizaríais
 You (pl)            you (pl) use    you (pl) used      you (pl) used to use     you (pl) will use   you (pl) would use
 Ellas/os / Uds      utilizan        utilizaron         utilizaban               utilizarán          utilizarían
 They/you (pl fml)   they use        they used          they used to use         they will use       they would use
 Pronoun             Present Perfect           Past Perfect               Future Perfect             Conditional Perfect
 Yo                  he utilizado              había utilizado            habré utilizado            habría utilizado
 I                   I have used               I had used                 I will have used           I would have used
 Tú                  has utilizado             habías utilizado           habrás utilizado           habrías utilizado
 You                 you have used             you had used               you will have used         you would have used
 Ella / Él / Ud      ha utilizado              había utilizado            habrá utilizado            habría utilizado
 She/he/you (fml)    s/he has used             s/he had used              s/he will have used        s/he would have used
 Nosotras/os         hemos utilizado           habíamos utilizado         habremos utilizado         habríamos utilizado
 We                  we have used              we had used                we will have used          we would have used
 Vosotras/os         habéis utilizado          habíais utilizado          habréis utilizado          habríais utilizado
 You (pl)            you (pl) have used        you (pl) had used          you (pl) will have used    you (pl) would have used
 Ellas/os / Uds      han utilizado             habían utilizado           habrán utilizado           habrían utilizado
 They/you (pl fml)   they have used            they had used              they will have used        they would have used
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Subjunctive tenses
 Pronoun             Present             Imperfect          Future
 Yo                  utilice             utilizara          utilizare
 I                   I use               I used             I will use
 Tú                  utilices            utilizaras         utilizares
 You                 you use             you used           you will use
 Ella / Él / Ud      utilice             utilizara          utilizare
 She/he/you (fml)    s/he uses           s/he used          s/he will use
 Nosotras/os         utilicemos          utilizáramos       utilizáremos
 We                  we use              we used            we will use
 Vosotras/os         utilicéis           utilizarais        utilizareis
 You (pl)            you (pl) use        you (pl) used      you (pl) will use
 Ellas/os / Uds      utilicen            utilizaran         utilizaren
 They/you (pl fml)   they use            they used          they will use
 Pronoun             Present Perfect              Past Perfect                  Future Perfect
 Yo                  haya utilizado               hubiera utilizado             hubiere utilizado
 I                   I have used                  I had used                    I will have used
 Tú                  hayas utilizado              hubieras utilizado            hubieres utilizado
 You                 you have used                you had used                  you will have used
 Ella / Él / Ud      haya utilizado               hubiera utilizado             hubiere utilizado
 She/he/you (fml)    s/he has used                s/he had used                 s/he will have used
 Nosotras/os         hayamos utilizado            hubiéramos utilizado          hubiéremos utilizado
 We                  we have used                 we had used                   we will have used
 Vosotras/os         hayáis utilizado             hubierais utilizado           hubiereis utilizado
 You (pl)            you (pl) have used           you (pl) had used             you (pl) will have used
 Ellas/os / Uds      hayan utilizado              hubieran utilizado            hubieren utilizado
 They/you (pl fml)   they have used               they had used                 they will have used
Imperative tenses                                                                                         Past participle & gerund
 Pronoun             Affirmative              Negative                                                     Past participle
 Tú                  utiliza                  no utilices                                                  utilizado
 You                 (to you) use!            (to you) don't use!                                          used
 Ella / Él / Ud      utilice                  no utilice                                                   Gerund
 She/he/you (fml)    (to you fml) use!        (to you fml) don't use!
                                                                                                           utilizando
 Nosotras/os         utilicemos               no utilicemos                                                using
 We                  let's use!               let's not use!
 Vosotras/os         utilizad                 no utilicéis
 You (pl)            (to you pl) use!         (to you pl) don't use!
 Ellas/os / Uds      utilicen                 no utilicen
 They/you (pl fml)   (to you pl fml) use!     (to you pl fml) don't use!
Any red dots ( ) above denote irregular conjugations.
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