Pre-U AQA Spanish: Formulas & Theorems Quick Reference Handbook | Pre-U AQA 西班牙语：公式定理速查手册

📚 Pre-U AQA Spanish: Formulas & Theorems Quick Reference Handbook | Pre-U AQA 西班牙语：公式定理速查手册

Welcome to your Pre-U AQA Spanish quick‑reference guide, where grammatical patterns are cast as precise formulas and usage rules as theorems. This handbook distils the most essential structures – verb conjugations, sequence of tenses, pronoun placement, and key distinctions like ser vs estar – into clear, repeatable patterns. Use it to drill, diagnose, and secure the accuracy that the Pre‑U examination demands.

欢迎使用 Pre‑U AQA 西班牙语速查手册。本手册将语法模式提炼为精确的公式，将用法规则归纳为定理。从动词变位、时态序列、代词位置到 ser 与 estar 的核心区别，所有关键结构均以清晰、可复现的模式呈现。你可以用它来反复操练、自我诊断，并牢牢掌握 Pre‑U 考试所要求的准确性。

1. Present Indicative Regular Conjugation Formula | 现在时陈述式规则变位公式

The present indicative describes habits, facts and ongoing actions. Its formula is disarmingly simple: remove the infinitive ending (-ar, -er, -ir) and attach the corresponding person ending. Once memorised, the three conjugation patterns unlock the vast majority of everyday verbs.

陈述式现在时描述习惯、事实和正在进行的动作。其公式非常简单：去掉不定式词尾（-ar、-er、-ir），加上对应的人称词尾。记住这三组变位模式，就能掌握绝大多数日常动词的现在时。

Formula: stem = infinitive minus ending; then stem + ending according to the table below. The ‑ar endings are: yo -o, tú -as, él/ella/usted -a, nosotros -amos, vosotros -áis, ellos/ellas/ustedes -an. For ‑er verbs the vowel becomes -e in most endings, while ‑ir mirrors ‑er except in the nosotros and vosotros forms.

公式：词干 = 不定式去掉词尾；然后词干 + 词尾，按下表使用。‑ar 动词词尾：yo -o、tú -as、él/ella/usted -a、nosotros -amos、vosotros -áis、ellos/ellas/ustedes -an。‑er 动词多数词尾以 e 为元音，而 ‑ir 动词与 ‑er 相似，但 nosotros 和 vosotros 形式不同。

2. Stem‑Changing Verbs: The Boot Theorem | 词干变化动词：“靴子定理”

Many verbs undergo a vowel change in the stressed syllable when the stem vowel is e or o. The pattern is often called the “boot” because the change affects all persons except nosotros and vosotros – tracing the shape of a boot on a traditional conjugation chart. The three main mutations are e → ie, o → ue and e → i.

许多动词在重读音节中发生元音变化，当词干元音为 e 或 o 时尤其常见。这个模式常被称为“靴子”，因为除了 nosotros 和 vosotros 外，所有人称都发生变化，在传统变位表上恰好勾勒出一只靴子的形状。三种主要变化类型是 e → ie、o → ue 和 e → i。

Examples: pensar (e → ie) gives pienso, piensas, piensa, pensamos, pensáis, piensan. Poder (o → ue) yields puedo, puedes, puede, podemos, podéis, pueden. Pedir (e → i) becomes pido, pides, pide, pedimos, pedís, piden. The nosotros and vosotros forms remain totally regular because the stress falls on the ending, not the stem.

例如：pensar（e → ie）变位为 pienso、piensas、piensa、pensamos、pensáis、piensan。poder（o → ue）变为 puedo、puedes、puede、podemos、podéis、pueden。pedir（e → i）变为 pido、pides、pide、pedimos、pedís、piden。nosotros 和 vosotros 形式完全规则，因为重音落在词尾而非词干上。

3. Preterite Tense Regular Formula | 简单过去时规则变位公式

The preterite expresses completed actions in the past. Its characteristic endings must be written with an acute accent on the first person singular and third person singular to mark the stress. The ‑ar endings are: ‑é, ‑aste, ‑ó, ‑amos, ‑asteis, ‑aron. Both ‑er and ‑ir verbs share: ‑í, ‑iste, ‑ió, ‑imos, ‑isteis, ‑ieron.

简单过去时表示已完成的过去动作。其标志性词尾必须在第一人称单数和第三人称单数上加重音符号，以标明重音位置。‑ar 动词的词尾为：‑é、‑aste、‑ó、‑amos、‑asteis、‑aron。‑er 和 ‑ir 动词共用：‑í、‑iste、‑ió、‑imos、‑isteis、‑ieron。

4. Imperfect Tense Formula | 过去未完成时公式

The imperfect describes ongoing, habitual or background actions in the past. Its conjugation is remarkably regular, with only three irregular verbs (ir, ser, ver). The formula for ‑ar verbs is stem + ‑aba endings; for ‑er and ‑ir verbs it is stem + ‑ía endings.

过去未完成时描述过去持续、习惯或背景性的动作。其变位极为规则，只有三个不规则动词（ir、ser、ver）。‑ar 动词的公式是词干 + -aba 系列词尾；‑er 和 ‑ir 动词为词干 + -ía 系列词尾。

5. Future and Conditional Stem Formulas | 将来时与条件式词干公式

Both the future and conditional tenses share the same irregular stems and are built on the full infinitive (or a modified infinitive) plus a set of endings. The future endings are: -é, -ás, -á, -emos, -éis, -án. The conditional endings are identical to the imperfect endings for -er/-ir verbs: -ía, -ías, -ía, -íamos, -íais, -ían.

将来时和条件式共用同一套不规则词干，其形式为完整不定式（或变形后的不定式）加系列词尾。将来时词尾为：-é、-ás、-á、-emos、-éis、-án。条件式词尾与过去未完成时 -er/-ir 动词词尾完全相同：-ía、-ías、-ía、-íamos、-íais、-ían。

Regular verbs simply attach the future endings directly to the infinitive: hablar → hablaré, comer → comeré, vivir → viviré. The conditional follows the same logic: hablaría, comería, viviría.

规则动词直接将将来时词尾加在不定式上：hablar → hablaré、comer → comeré、vivir → viviré。条件式同理：hablaría、comería、viviría。

6. Compound Tenses: Haber + Past Participle | 复合时态：haber + 过去分词公式

All perfect compound tenses are formed by a conjugated form of auxiliary haber and an invariable past participle. The participle for ‑ar verbs ends in ‑ado, for ‑er and ‑ir verbs in ‑ido. Common examples: he hablado (present perfect), había comido (pluperfect), habré vivido (future perfect).

所有完成时态的复合结构均由助动词 haber 的变位形式加上不变的过去分词构成。‑ar 动词的过去分词以 ‑ado 结尾，‑er 和 ‑ir 动词以 ‑ido 结尾。常见例子：he hablado（现在完成时）、había comido（过去完成时）、habré vivido（将来完成时）。