update: elaborate on irregular forms of spanish preterite verbs

article: pretérito: el tiempo pasado

diff --git a/src/spanish-preterite.md b/src/spanish-preterite.md
index 33c0017..bbf9944 100644
--- a/src/spanish-preterite.md
+++ b/src/spanish-preterite.md
@@ -52,10 +52,217 @@ por lo que se utiliza el contexto para desambiguar.
 ## verbos irregulares
 
 Los verbos irregulares son mas dificíl por aprender.
-Escribiré mas sobre estas formas cuando las aprenda.
 
-**por ejemplo**
+Hay muchos verbos irregulares en el pretérito,
+pero no tienes que memorizar todos uno por uno.
+Al emplear una estrategia de agrupación,
+se puede reducir significativamente la cantidad de elementos que hay que aprender.
+
+Para una referéncia rapida se utiliza este hoja.  
+[hoja de trucos del pretérito](https://cdn.oclyke.dev/Spanish-Preterite-Cheat-Sheet-2025-1.pdf)
+
+### verbos del estilo “tener”
+
+These verbs all follow a similar pattern;
+they get a little “uv” in there, AND they don't care about their ending
+(‘-ar’ verbs conjugate the same as ‘-er’ and ‘-ir’ verbs – **they're ALL the same!**)
+
+* they get a little “uv” in there
+* they drop the accents on the first and third-person forms
+* they don't differentiate based on their infinitive endings
+
+In addition to those rules each verb here might get its own special little treatment.  
+(look out for ‘hacer’ – él tienen un letro irregular; el zed)
+
+* **tener** → ‘tuv–’
+* **estar** → ‘estuv–’
+* **andar** → ‘anduv–’
+* **hacer** → ‘hic–’ (does not get ‘uv’ but still follows this form closely)
+
+*person* | *suffix* | tener | estar | andar | hacer
+---|---|---|---|---|---
+*yo* | *–e* | tuve | estuve | anduve | hice
+*tú* | *–iste* | tuviste | estuviste | anduviste | hiciste
+*él* / *ella* / *usted* | *–o* | tuvo | estuvo | anduvo | hi**z**o
+*nosotros* | *–imos* | tuvimos | estuvimos | anduvimos | hicimos
+*vosotros* | *–isteis* | tuvisteis | estuvisteis | anduvisteis | hicisteis
+*ellos* / *ellas* / *ustedes* | *–ieron* | tuvieron | estuvieron | anduvieron | hicieron
+
+*person* | *suffix* | saber | querer | poder | poner | venir
+---|---|---|---|---|---|---
+*yo* | *–e* | supe | quise | pude | puse | vine
+*tú* | *–iste* | supiste | quisiste | pudiste | pusiste | viniste
+*él* / *ella* / *usted* | *–o* | supo | quiso | pudo | puso | vino
+*nosotros* | *–imos* | supimos | quisimos | pudimos | pusimos | vinimos
+*vosotros* | *–isteis* | supisteis | quisisteis | pudisteis | pusisteis | venisteis
+*ellos* / *ellas* / *ustedes* | *–ieron* | supieron | quisieron | pudieron | pusieron | venieron
+
+### verbos que tienen la raíz ‘j’
+
+Verbs with ‘j’ in the stem all have the standard suffixes, except for the third-person plural which drops the ‘i’ in `ieron` to become **`eron`**.
+
+* decir has an extra little change here; `e` → `i` to change the root `dec` to the preterite stem `dij`. 
+
+*person* | *suffix* | conducir | producir | traducir | traer | decir
+---|---|---|---|---|---|---
+*yo* | *–e* | conduje | produje | traduje | traje | dije
+*tú* | *–iste* | condujiste | produjiste | tradujiste | trajiste | dijiste
+*él* / *ella* / *usted* | *–o* | condujo | produjo | tradujo | trajo | dijo
+*nosotros* | *–imos* | condujimos | produjimos | tradujimos | trajimos | dijimos
+*vosotros* | *–isteis* | condujisteis | produjisteis | tradujisteis | trajisteis | dijisteis
+*ellos* / *ellas* / *ustedes* | *–ieron* | conduj**eron** | produj**eron** | traduj**eron** | traj**eron** | dij**eron**
+
+### verbos contenedor
+
+Some verbs are constructed with prefixes on core forms that are covered above.
+These container verbs are conjugated in exactly the same way as their core.
+
+poner | hacer |tener | venir | decir
+---|---|---|---|---
+**com**poner | **des**hacer | **de**tener | **con**venir | **pre**decir
+**descom**poner | **re**hacer | **re**tener | **pre**venir | **contra**decir
+**pro**poner | | **con**tener | 
+**dis**poner | | | 
+
+
+### ver + dar
+
+`ver` and `dar` both drop the accents in the first and third person,
+and they are both conjugated in the `–er`/`–ir` form (not withstanding the infinitive `–ar` ending of dar)
+
+*person* | ver | dar
+---|---|---
+*yo* | vi | di
+*tú* | viste | diste
+*él* / *ella* / *usted* | vio | dio
+*nosotros* | vimos | dimos
+*vosotros* | visteis | disteis
+*ellos* / *ellas* / *ustedes* | vieron | dieron
+
+### ser + ir
+
+`ser` and `ir` actually get the same exact forms when conjugated in the preterite.
+
+*person* | ser \| ir
+---|---
+*yo* | fui
+*tú* | fuiste
+*él* / *ella* / *usted* | fue
+*nosotros* | fuimos
+*vosotros* | fuisteis
+*ellos* / *ellas* / *ustedes* | fueron
+
+Context helps to make the distinction here.
+Typically the `ir` usage is followed by `a`.
+
+ir | ser
+---|---
+“fuimos **a** la playa” | “fuimos enomorada”
+*“we went to the beach”* | *“we were in love”*
+
+### verbos piratas 🦜
+
+Because so much meaning is carried by the stem of a verb the language tries hard to keep the original sounds intact.
+
+For the pirate verbs – which end in `-car`, `-gar`, and `-zar` – the **first person form** needs a spelling change.  
+(Suffixes for the other persons do not have the same problem that `é` does with changing the sound of the preceding consonant.)
+
+**–car verbs**
+
+`c` → `qu` to preserve the hard `/k/` sound before `é`.
+
+*person* | buscar | tocar | sacar | practicar | explicar
+---|---|---|---|---|---
+*yo* | bus**qu**é | to**qu**é | sa**qu**é | practi**qu**é | expli**qu**é
+*tú* | buscaste | tocaste | sacaste | practicaste | explicaste
+*él* / *ella* / *usted* | buscó | tocó | sacó | practicó | explicó
+*nosotros* | buscamos | tocamos | sacamos | practicamos | explicamos
+*vosotros* | buscasteis | tocasteis | sacasteis | practicasteis | explicasteis
+*ellos* / *ellas* / *ustedes* | buscaron | tocaron | sacaron | practicaron | explicaron
+
+**–gar verbs**
+
+`g` → `gu` to preserve the hard `/g/` sound before `é`.
+
+*person* | llegar | pagar | jugar | entregar | navegar
+---|---|---|---|---|---
+*yo* | lle**gu**é | poa**gu**é | entre**gu**é | nave**gu**é
+*tú* | llegaste | pagaste | jugaste | entregaste | navegaste
+*él* / *ella* / *usted* | llegó | pagó | jugó | entregó | navegó
+*nosotros* | llegamos | pagamos | jugamos | entregamos | navegamos
+*vosotros* | llegasteis | pagasteis | jugasteis | entregasteis | navagasteis
+*ellos* / *ellas* / *ustedes* | llegaron | pagaron | jugaron | entregaron | navegaron
+
+**–zar verbs**
+
+`z` → `c` to preserve the soft `/s/` sound before `é`.
+
+*person* | empezar | comenzar | almorzar | cruzar | organizar
+---|---|---|---|---|---
+*yo* | empe**c**é | comen**c**é | almor**c**é | cru**c**é | organi**c**é
+*tú* | empezaste | comenzaste | almorzaste | cruzaste | organizaste
+*él* / *ella* / *usted* | empezó | comenzó | almorzó | cruzó | organizó
+*nosotros* | empezamos | comenzamos | almorzamos | cruzamos | organizamos
+*vosotros* | empezasteis | comenzasteis | almorzasteis | cruzasteis | organizasteis
+*ellos* / *ellas* / *ustedes* | empezaron | comenzaron | almorzaron | cruzaron | organizaron
+
+### I → Y verbs
+
+`<vowel>{-er/-ir}` verbs in the preterite
+
+Verbs whose infinitive has `–eer`, `–oír`, or `–uir`  
+(but not `-guir`).
+
+`i` changes to `y` in the third person (singular and plural).
+
+**–eer verbs**
+
+*person* | leer | releer | creer | poseer | proveer
+---|---|---|---|---|---
+*yo* | leí | releí | creí | poseí | proveí
+*tú* | le**í**ste | rele**í**ste | cre**í**ste | pose**í**ste | prove**í**ste
+*él* / *ella* / *usted* | le<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | rele<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | cre<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | pose<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | prove<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó
+*nosotros* | le**í**mos | rele**í**mos | cre**í**mos | pose**í**mos | prove**í**mos
+*vosotros* | le**í**steis | rele**í**steis | cre**í**steis | pose**í**steis | prove**í**steis
+*ellos* / *ellas* / *ustedes* | le<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | rele<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | cre<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | pose<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | prove<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron
+
+
+**–aer verbs**
+
+This group is really small – just about only ‘caer’ and ‘recaer’ – because other ‘–aer’ verbs usually fit in the strong irregular “tener” family.
+
+*person* | caer | recaer
+---|---|---
+*yo* | caí | recaí
+*tú* | ca**í**ste | reca**í**ste 
+*él* / *ella* / *usted* | ca<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | reca<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó
+*nosotros* | ca**í**mos | reca**í**mos
+*vosotros* | ca**í**steis | reca**í**steis 
+*ellos* / *ellas* / *ustedes* | ca<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | reca<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron
+
+
+**–uir verbs**
+
+(These verbs are a special subgroup because they do not have accents in yo / tú forms)
+
+*person* | huir | construir | destruir | incluir | concluir | sustituir
+---|---|---|---|---|---|---
+*yo* | huí | construí | destruí | incluí | concluí | sustituí
+*tú* | huiste | construiste | destruiste | incluiste | concluiste | sustituiste
+*él* / *ella* / *usted* | hu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | constru<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | destru<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | inclu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | conclu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó | sustitu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>ó
+*nosotros* | huimos | construimos | destruimos | incluimos | concluimos | sustituimos
+*vosotros* | huisteis | construisteis | destruisteis | incluisteis | concluisteis | sustituisteis
+*ellos* / *ellas* / *ustedes* | hu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | constru<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | destru<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | inclu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | conclu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron | sustitu<span style="animation: rainbowFlash 0.35s linear infinite;">**y**</span>eron
 
-* ”Preparándose para dirigirse a su consejo, la reina se vistió con un vestido elaborado.”  
-“Preparing to address her council, the queen dressed in an elaborate gown.”  
-(`vestirse`, `ella`, `pretérito simple`)
+<style>
+@keyframes rainbowFlash{
+  0%{color:#ff0000}
+  14%{color:#ff7f00}
+  28%{color:#ffff00}
+  42%{color:#00ff00}
+  57%{color:#0000ff}
+  71%{color:#4b0082}
+  85%{color:#8b00ff}
+  100%{color:#ff0000}
+}
+</style>