Drill the ten Spanish verbs that rebuild their preterite stem entirely, tener to tuv-, decir to dij-, grouped by shared pattern rather than memorized alone.
Every regular Spanish verb builds its preterite from the infinitive stem plus a predictable set of endings. Ten common verbs break that pattern entirely and rebuild the stem itself, tuve, not tené, pude, not podí. Most textbooks mention this in passing without pointing out that these irregular stems cluster into a small number of families that behave the same way once the pattern is visible, rather than ten unrelated facts to hold in memory one at a time. This tool drills the irregular stem groups by family. Stem group is [STEM_GROUP:select:U-stem group (tener / estar / poder / poner / saber),I-stem group (venir / hacer / querer),J-stem group (decir / traer),Ir and ser (identical irregular preterite form),Mixed across all irregular groups]. Specific verbs are [SPECIFIC_VERBS?] (name particular verbs within the group, or leave blank and the group's core verbs will get covered). Sentence context is [SENTENCE_CONTEXT] (a topic or scenario for the example sentences, like "a trip that went wrong" or "what happened at work yesterday"). CEFR level is [CEFR_LEVEL:select:A2 (elementary),B1 (intermediate),B2 (upper intermediate)]. I need [ITEM_COUNT:number:10-30] sentences. Show each irregular stem plainly next to its infinitive so the shift is visible: tener becomes tuv-, estar becomes estuv-, poder becomes pud-, poner becomes pus-, saber becomes sup-, venir becomes vin-, hacer becomes hic- in most forms and hiz- in the third person singular to keep the right sound before o, querer becomes quis-, and decir and traer both take a j in the stem, dije, traje. For the j-stem group, apply the extra irregularity that drops the i from the usual ellos ending, dijeron and trajeron, not dijieron or trajieron, since that dropped letter is a second trap layered right on top of the stem change itself. For ir and ser, note plainly that both verbs share the exact same irregular preterite form, fui, fuiste, fue, fuimos, fuisteis, fueron, and that only surrounding context tells a reader which verb is meant, since nothing in the form itself distinguishes them. Match sentence complexity and vocabulary to [CEFR_LEVEL], and vary the subject pronoun across items so the same irregular stem gets practiced across more than one conjugated ending instead of repeating the yo form over and over. Close by grouping the irregular stems used in this batch by shared pattern, not by verb meaning. Recognizing that tener, estar, poder, poner, and saber all take the same kind of stem shift is what makes the irregularity stick, instead of ten separate facts to memorize on their own.
Range: 10 - 30
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Get Early AccessTen of the most common Spanish verbs abandon the regular preterite pattern entirely and swap in a whole new stem. Tener doesn't become tené in the past, it becomes tuve. What most textbooks skip past quickly is that these irregular stems cluster into a small number of families that behave the same way once you see the pattern, instead of ten unrelated forms to memorize one at a time.
Set [STEM_GROUP] to drill the u-stem family (tener, estar, poder, poner, saber), the i-stem family (venir, hacer, querer), the j-stem family (decir, traer), the shared ir and ser form, or all of them mixed together. Name [SPECIFIC_VERBS] if you want particular ones, add a [SENTENCE_CONTEXT] so the examples have somewhere real to live, and match [CEFR_LEVEL] to your actual level.
Each stem gets shown next to its infinitive so the shift is visible instead of buried inside a fully conjugated form, and the j-stem verbs get their second irregularity flagged too, dijeron and trajeron drop the i that a regular ellos ending would otherwise carry. Once these stems feel solid, the Spanish past participle vs past tense practice generator drills the other set of irregulars living in the perfect tenses instead of the simple preterite, and the Spanish future tense practice generator shows several of these same verbs, tener, poner, venir, decir, hacer, building a completely different irregular stem for the future. Group the stems by family in the Dock Editor once tuve and dije stop needing a lookup.
Paste this into the Dock Editor, or hand it to ChatGPT, Claude, or Gemini, then set [STEM_GROUP] to the u-stem, i-stem, j-stem, ir/ser, or mixed family of irregular verbs.
Fill in [SPECIFIC_VERBS], or leave it blank and get the group's core, highest-frequency verbs.
Add [SENTENCE_CONTEXT] so the example sentences have a real scenario to draw from, not a random unrelated topic.
Match [CEFR_LEVEL] to your real ability, and set [ITEM_COUNT] for how many sentences you want.
Check the closing summary that groups this batch's stems by shared pattern, not by individual verb, before your next study session.
Practice the ten irregular verbs that swap their entire stem, grouped by family instead of memorized one at a time from a flat list.
Build sentences that use irregular preterite stems inside real storytelling context, not isolated conjugation tables.
Drill the identical fui, fuiste, fue form both verbs share, and practice reading context to tell them apart correctly.
Generate a leveled batch organized by stem family for a specific class session instead of one long, undifferentiated list.
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