* For verbs whose infinitive ends in -CAR, the -c becomes -qu before the e

BUSCAR (To look for) ==> Busco (Ind. Present) ==> Busqué (Preterite) ==> Busque (Subjunctive).

* For verbs whose infinitive ends in -GAR the -g becomes -gu before the e

REGAR (To water) ==> Riego (Ind. Present) ==> Regué (Preterite) ==> Riegue (Subjunctive).

* For verbs whose infinitive ends in -GUAR the -gu becomes -gü before the e

AVERIGUAR (To discover) ==> Averiguo (Ind. Present) ==> Averigüé (Preterite) ==> Averigüe (Subjunctive).

* For verbs whose infinitive ends in -ZAR the z becomes a c before the e

AMENAZAR (To threaten) ==> Amenazo (Ind. Present), Amenacé (Preterite), Amenace (Subjunctive).

N.B : These changes occur in the first person preterite and in all persons of the present subjunctive.

* For verbs ending in -CER or -CIR, the -c becomes -z before the a or the o

– CONVENCER (To convince) ==> Convenzo (Ind. Present, 1st person) ==> Convenza (Present subjunctive).
– ESPACIR (To spread) ==> Esparzo (Ind. Present, 1st person) ==> Esparza (Present subjunctive).

* For verbs ending in -GER or -GIR, the -g becomes -j before the a or the o

– COGER (To take) ==> Cojo (Ind. Present, 1st person) ==> Coja (Present subjunctive).
– DIRIGIR (To lead) ==>Dirijo (Ind. Present, 1st person) ==> Dirija (Present subjunctive).

* For verbs whose infinitive ends in –GUIR, the -gu becomes -g before the a or the o

DISTINGUIR (To differentiate) ==> Distingo (Ind. Present, 1st person) ==> Distinga (Present subjunctive).

* For verbs whose infinitive ends in –QUIR, the -qu becomes -c before the a or the o

DELINQUIR (To commit a crime) ==> Delinco (Ind. Present, 1st person) ==> Delinca (Present subjunctive).

N.B : These changes occur only in the first person of the present indicative and in all persons of the present subjunctive.

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