📚 GCSE AQA Law: Formula & Principle Quick Reference Guide | GCSE AQA 法律：公式定理速查手册
Legal rules may not look like equations, but every area of law can be expressed through clear ‘formulas’ that link required elements to legal outcomes. This quick reference guide breaks down the core principles of criminal law, tort law, and contract law — the three main pillars of the AQA GCSE Law specification — into memorable formulas. Whether you are revising actus reus and mens rea, the Caparo test for negligence, or the ingredients of a valid contract, these structures will help you organise your answers and spot missing elements in any scenario question.
法律规则也许不像方程式，但法律的每个领域都可以通过清晰的“公式”来表达，这些公式将必要要件与法律后果联系起来。这本速查手册将刑法、侵权法和合同法——AQA GCSE 法律教学大纲的三大支柱——的核心原则拆解为便于记忆的公式。无论你是在复习犯罪行为与犯罪意图、过失侵权的 Caparo 三步检验，还是有效合同的构成要素，这些结构都能帮助你组织答案，并在任何情境题中迅速识别缺失的要件。
1. The Crime Equation: Actus Reus + Mens Rea | 犯罪等式：犯罪行为 + 犯罪意图
For virtually all criminal offences, liability depends on proving two fundamental building blocks. The prosecution must establish that the defendant committed a guilty act (actus reus) and possessed a guilty mind (mens rea) at the same time, with no valid defence present. This basic equation underpins the whole of substantive criminal law.
几乎所有刑事犯罪的责任都取决于对两个基本构建模块的证明。控方必须证明被告在实施犯罪行为（actus reus）的同时具备犯罪意图（mens rea），且不存在有效的抗辩事由。这一基本等式是整个实体刑法的根基。
Actus Reus + Mens Rea + Absence of Defence = Criminal Liability
犯罪行为 + 犯罪意图 + 无抗辩事由 = 刑事责任
Actus Reus can consist of an act, an omission (where a duty exists), or a state of affairs. It must be voluntary. Mens Rea varies by offence: intention (direct or oblique), recklessness (subjective Cunningham recklessness for most non-fatal offences), negligence, or knowledge. The coincidence principle requires that mens rea coexists with the actus reus, though the courts can interpret a continuing act to satisfy this.
犯罪行为可以由一个作为、一个不作为（存在法定义务时）或一种状态构成，且必须是自愿的。犯罪意图因罪名而异：意图（直接或间接）、轻率（对多数非致命犯罪适用主观的 Cunningham 轻率标准）、过失或明知。同步性原则要求犯罪意图与犯罪行为同时存在，不过法院可通过“持续行为”的解释来满足这一要求。
If any component is absent — for example, the act was involuntary, there was no mens rea, or a complete defence applies — the equation fails and the defendant must be acquitted. Typical complete defences include self-defence, duress, and insanity.
如果任一要件缺失——例如行为非自愿、不存在犯罪意图或某项完全抗辩事由成立——等式便不成立，被告必须被宣告无罪。常见的完全抗辩事由包括自卫、胁迫和精神错乱。
2. Causation in Criminal Law | 刑法中的因果关系
In result crimes such as murder or ABH, the prosecution must prove not only that the defendant performed the actus reus but also that this act caused the prohibited consequence. Causation has two layers, each acting like a filter that must be satisfied for liability to attach.
在谋杀或实际身体伤害等结果犯中，控方不仅要证明被告实施了犯罪行为，还必须证明该行为导致了受禁止的后果。因果关系分为两个层次，就像两道必须通过的过滤器，只有同时满足才能归责。
Factual Causation + Legal Causation = Causation Established
事实因果关系 + 法律因果关系 = 因果关系成立
Factual causation is tested by the ‘but for’ test: but for the defendant’s conduct, would the result have occurred? If the answer is ‘yes’, factual causation fails (R v White). Legal causation requires that the defendant’s act was an operating and substantial cause of the result (R v Smith). It need not be the sole cause. A chain of causation can be broken by a new intervening act that is sufficiently independent and unforeseeable, such as a third party’s free, deliberate and informed act or a highly abnormal medical complication.
事实因果关系通过“若无则不”检验来判断：若无被告的行为，危害结果是否会发生？若答案为“是”，则事实因果关系不存在（详见 White 案）。法律因果关系要求被告的行为是危害结果的实质且可操作的原因（详见 Smith 案），它不必是唯一原因。因果关系链可以被一个足够独立且不可预见的新介入行为所中断，例如第三方自由、自愿且有意识的行为，或极不寻常的医疗并发症。
Thin skull rule: a defendant must take the victim as they find them. If the victim has a hidden condition that makes the harm more severe, the defendant is still fully liable for the outcome (R v Blaue). This is not an intervening act.
蛋壳脑袋规则：被告必须接受被害人的特殊体质。如果被害人存在某种隐藏状况导致损害加重，被告仍须对该结果承担全部责任（详见 Blaue 案）。这不属于介入行为。
3. Strict Liability Crimes | 严格责任犯罪
Not all offences require a mens rea element for every part of the actus reus. Strict liability offences break the standard crime equation by demanding proof only of the guilty act, making them powerful tools for regulatory enforcement.
并非所有犯罪都要求对犯罪行为的每一个部分具有犯罪意图。严格责任犯罪打破了标准犯罪等式，只要求证明犯罪行为，这使其成为执行监管规定的有力工具。
Actus Reus (with no mens rea for at least one element) = Strict Liability Offence
犯罪行为（至少一个要素不要求犯罪意图） = 严格责任犯罪
Strict liability is typically imposed by statute on matters of social concern — selling alcohol to minors, food safety, pollution, or driving offences. The presumption of mens rea can be rebutted if the statute is silent, the offence is regulatory rather than truly criminal, and strict construction promotes the statutory purpose (Gammon tests). Offences that carry severe stigma or heavy penalties are less likely to be interpreted as strict liability.
严格责任通常由成文法对涉及社会关切的领域施加——向未成年人售酒、食品安全、污染或驾驶犯罪。如果法律条文未明确规定犯罪意图、罪名属于管制性质而非真正刑事犯罪、且严格解释有助于实现立法目的，则 mens rea 推定可被推翻（Gammon 检验标准）。那些带有严重污名或重罚的犯罪很少被解释为严格责任。
Key advantage: strict liability promotes higher standards of care because defendants cannot argue they took all reasonable precautions. Defences such as due diligence are sometimes available if drafted into the statute, but mistake and lack of fault are generally irrelevant.
关键优势：严格责任能促使人们提高注意标准，因为被告不能辩称其已采取所有合理预防措施。如果法律条文明确规定，有时可援引“尽职调查”等抗辩，但错误与无过错通常无关紧要。
4. Non-Fatal Offences: Assault, Battery, ABH, GBH | 非致命犯罪：殴打、攻击、实际身体伤害、严重身体伤害
Non-fatal offences against the person form a ladder of liability where the required mens rea and the degree of harm determine which offence applies. Memorising each offence as a self-contained formula helps you match the correct charge to the facts.
针对人身的非致命犯罪构成了一套阶梯式的责任体系，所需犯罪意图和伤害程度决定了适用哪一罪名。将每个犯罪作为独立公式来记忆，可以帮助你根据案情匹配正确的指控。
| Offence | AR Formula | MR Formula |
|---|---|---|
| Assault | Causing victim to apprehend immediate unlawful force | Intention or recklessness as to causing apprehension |
| Battery | Application of unlawful force to another | Intention or recklessness as to applying unlawful force |
| ABH (s.47) | Assault or battery causing actual bodily harm | Intention or recklessness as to the assault/battery (no MR needed for the harm) |
| GBH (s.20) | Wounding or inflicting grievous bodily harm | Malice: intention or recklessness as to some bodily harm |
| GBH (s.18) | Wounding or causing grievous bodily harm | Intention to cause GBH or intention to resist/prevent lawful apprehension + intention/recklessness as to GBH |
中文速查：殴打——使被害人担忧即将遭受非法武力 + 意图或轻率导致担忧；攻击——对他人施加非法武力 + 意图或轻率；实际身体伤害（s.47）——殴打或攻击导致实际身体伤害，犯罪意图仅针对基础犯罪；s.20 严重身体伤害——创伤或造成严重身体伤害，恶意即意图或轻率造成某些身体伤害；s.18 严重身体伤害——创伤或造成严重身体伤害，要求特定意图。
A critical distinction: ABH uses ‘occasioning’ and requires proof of causation between the base assault/battery and the harm. S.20 GBH requires the defendant to ‘wound or inflict’ GBH, while s.18 requires ‘wounding or causing’ GBH with a specific intent that makes it the most serious and carries a maximum life sentence.
一个关键区别：ABH 采用“引起”一词，要求证明基础殴打或攻击与实际身体伤害之间的因果关系。s.20 GBH 要求被告“创伤或造成”严重身体伤害，而 s.18 则要求“创伤或造成”严重身体伤害且具有特定意图，这是最严重的形态，最高可判处终身监禁。
5. Theft and Property Offences | 盗窃及财产犯罪
Theft and its related offences have rigid statutory definitions laid out in the Theft Act 1968. Each can be reduced to a precise checklist of physical and mental elements that must coincide for a conviction.
盗窃及相关犯罪在《1968年盗窃法》中有着严格的成文法定义。每一个都可以被简化为一份精确的物理要素与心理要素清单，只有当它们同时具备时才能定罪。
Theft: Appropriation + Property + Belonging to Another + Dishonesty + Intention to Permanently Deprive
盗窃：占有行为 + 财产 + 属于他人 + 不诚实 + 永久剥夺的意图
Appropriation includes assuming any of the rights of the owner, and it can occur even with the owner’s consent (R v Gomez). Property includes money, personal property, and intangible property, but not land generally (except in specific cases). The Ghosh test for dishonesty has been replaced by the Ivey test: was the defendant’s conduct dishonest by the standards of ordinary reasonable people? If yes, did the defendant realise their conduct was dishonest by those standards? (No second limb requiring the defendant’s own standard.) Intention to permanently deprive includes treating the property as one’s own regardless of the owner’s rights.
“占有行为”包括行使所有者的任何一项权利，即使得到所有者同意也可能构成占有（Gomez 案）。财产包括货币、动产和无体财产，但通常不包括土地（特定情形除外）。不诚实的 Ghosh 检验标准已被 Ivey 检验标准取代：被告的行为按照普通理性人的标准是否不诚实？如果是，被告是否意识到其行为按该标准是不诚实的？（不再需要被告自己的标准作为第二步。）永久剥夺意图包括将他人财产视同己有、无视所有者权利的情形。
Robbery is theft with force or threat of force immediately before or at the time of stealing: Theft + Force/Putting in Fear = Robbery. Burglary under s.9(1)(a) is entry into any building/part of a building as a trespasser with intent to commit theft, GBH, or criminal damage. S.9(1)(b) adds actually committing those offences after entry.
抢劫是在盗窃的同时或即将盗窃之前使用武力或以武力相威胁：盗窃 + 武力/使人恐惧 = 抢劫。入室盗窃根据 s.9(1)(a)：作为侵入者进入任何建筑或建筑的一部分，并怀有盗窃、造成严重身体伤害或刑事毁坏的意图。s.9(1)(b) 则是在进入后实际实施了这些犯罪。
6. General Defences: Self-Defence and Duress | 一般抗辩：自卫与胁迫
Even when the crime equation is satisfied on its face, a defendant may avoid liability by raising a complete defence. These defences operate like an override switch, turning what would otherwise be a guilty verdict into an acquittal if certain criteria are met.
即使犯罪等式表面上已成立，被告仍可通过提出完全抗辩事由来避免责任。这些抗辩就像一个超越开关，只要满足特定条件，原本的有罪判决就会转变为无罪开释。
Self-Defence: Honest Belief in Need + Reasonable Force = Lawful Defence
自卫：诚实地相信有必要 + 合理程度的武力 = 合法抗辩
Self-defence and the prevention of crime (s.3 Criminal Law Act 1967) require two questions: (1) Did the defendant honestly believe that it was necessary to use force? The belief need not be reasonable, but the more unreasonable it is, the less likely the jury will accept it. (2) Was the degree of force actually used reasonable in the circumstances as the defendant believed them to be? The jury weighs the threat against the response, leaving some leeway for a defendant acting in the heat of the moment.
自卫与制止犯罪（《1967年刑法法》第3条）需要回答两个问题：（1）被告是否诚实地相信有必要使用武力？该相信不要求合理，但越不合理，陪审团越不可能采信。（2）实际使用的武力程度在被告相信的情况下是否合理？陪审团会权衡威胁与反击手段，并为紧急关头下行动的被告留出一定余地。
Duress applies when the defendant is forced to commit an offence because of threats of death or serious injury. Duress by threats formula: Threat of death or serious injury + threat directed against defendant or a person for whom they reasonably regard themselves as responsible + reasonable person would have acted as the defendant did + no reasonable avenue of escape + defendant did not voluntarily expose themselves to the threat. Duress cannot be used for murder, attempted murder, or certain treason offences.
胁迫适用于被告因受到死亡或严重伤害的威胁而被迫实施犯罪的情形。威胁胁迫的公式：死亡或严重伤害的威胁 + 威胁针对被告或其合理认为应对其负责的人 + 正常理性人在同样情境下也会如此行动 + 没有合理的逃脱途径 + 被告并非自愿置身于威胁之下。胁迫不可用于谋杀、谋杀未遂或某些叛国罪。
7. Negligence: The Tort Formula | 过失侵权公式
In tort law, negligence provides a remedy for those who have suffered damage caused by another’s carelessness. Unlike criminal offences, the objective is compensation rather than punishment, and the formula reflects a continuous sequence of proof.
在侵权法中，过失侵权为因他人疏忽而遭受损害的人提供救济。与刑事犯罪不同，其目标是补偿而非惩罚，其公式体现为一个连续的证明序列。
Duty of Care + Breach of Duty + Causation + Damage = Successful Negligence Claim
注意义务 + 违反义务 + 因果关系 + 损害 = 过失侵权索赔成功
All four components must be established on the balance of probabilities. If any link is missing, the claim collapses. Damage must be of a type recognised by law: personal injury, property damage, or pure economic loss in limited circumstances. Psychiatric harm follows special rules but still fits within the formula.
所有四个组成部分都必须在盖然性权衡标准下得到证明。如果任一环节缺失，索赔即告失败。损害必须是法律认可的类型：人身伤害、财产毁损，或在有限情形下的纯粹经济损失。精神损害适用特殊规则，但仍可纳入该公式框架。
| Element | Core Test |
|---|---|
| Duty of care | Caparo v Dickman: foreseeability of harm, proximity, and fair, just and reasonable to impose a duty |
| Breach | Reasonable person standard + risk factors (likelihood of harm, seriousness, cost of precautions, social utility) |
| Causation | Factual: ‘but for’ test. Legal: damage must not be too remote (reasonable foreseeability of type of damage) |
| Damage | Compensable harm that is not trivial |
中文对应：注意义务——Caparo 三要素：损害的可预见性、当事人之间关系足够接近、且施加义务是公平、公正和合理的；违反义务——理性人标准加上风险因素（损害发生的可能性、严重性、预防措施的成本、行为的社会效益）；因果关系——事实因果关系“若无则不”，法律因果关系要求损害不能太过遥远（损害的类型可合理预见）；损害——可赔偿的、非微不足道的损害。
8. Duty of Care and Breach | 注意义务与违反
Establishing a duty of care is the gateway to a negligence claim. The Caparo test synthesises earlier rulings into a flexible tool that the courts refine case by case. Once a duty is found, the standard of care is measured objectively, and the circumstances determine whether the defendant fell below that standard.
确立注意义务是进入过失侵权索赔的门户。Caparo 检验将先前的判决综合成一项灵活的工具，法院逐案加以完善。一旦认定存在义务，注意标准便以客观方式衡量，具体情况决定被告是否未达到该标准。
Foreseeability + Proximity + Fair, Just and Reasonable = Duty of Care
可预见性 + 接近性 + 公平公正合理 = 注意义务
Foreseeability asks whether a reasonable person in the defendant’s position would have foreseen that their conduct could cause harm to a person in the claimant’s position. Proximity can be physical, relational, or causal. The policy element of ‘fair, just and reasonable’ allows courts to deny a duty even where the first two limbs are satisfied, such as to avoid imposing indeterminate liability on public bodies.
可预见性考察处于被告位置的理性人是否能够预见其行为可能对处于原告位置的人造成损害。接近性可以是空间上的、关系上的或因果上的。政策要素“公平、公正与合理”使法院即使在前两项条件满足时仍可拒绝认定注意义务，例如避免对公共机构施加不特定的责任。
Breach of duty compares the defendant’s conduct with that of the hypothetical reasonable person. The court considers four factors from cases like Bolton v Stone and Latimer: (1) likelihood of harm — how great was the risk that injury would occur? (2) seriousness of the potential harm; (3) the cost and practicality of taking precautions; and (4) the social utility of the defendant’s activity. A higher risk demands greater precautions, and a valuable emergency service may justify a lower standard in the moment.
违反义务通过将被告的行为与假定的理性人进行比较来判断。法院会考虑源自 Bolton v Stone 和 Latimer 等案的四项因素：（1）损害发生的可能性——发生伤害的风险有多大？（2）潜在损害的严重性；（3）采取预防措施的成本与实际可行性；（4）被告活动的社会效用。风险越高，所需采取的预防措施就越多；而有价值的紧急服务在当时或许有理由适用较低的注意标准。
9. Causation and Damage in Tort | 侵权中的因果关系与损害
As in criminal law, the tort of negligence requires the claimant to prove that the defendant’s breach caused their loss. The same two-stage causation model applies, with some important tort-specific refinements on remoteness and intervening acts.
与刑法相同，过失侵权要求原告证明被告违反义务的行为造成了其损失。同样适用两阶段因果关系模型，但在损害的遥远性与介入行为方面存在一些侵权法特有的细化规则。
Factual Causation (‘but for’) + Legal Causation (no novus actus + foreseeable type) = Causation
事实因果关系（“若无则不”）+ 法律因果关系（无新介入行为 + 损害类型可预见） = 因果关系
Factual causation in tort uses the ‘but for’ test. Where there are multiple concurrent causes, the ‘material contribution’ test may assist (Bonnington Castings). Legal causation asks whether there has been a break in causation — a novus actus interveniens — such as a naturally occurring event, a third party’s act, or the claimant’s own act that is entirely unreasonable. The defendant remains liable even if the precise extent of damage was unforeseeable, so long as the kind of damage was reasonably foreseeable (The Wagon Mound).
侵权中的事实因果关系采用“若无则不”检验。如果存在多个并发原因，可借助“实质性贡献”检验（Bonnington Castings 案）。法律因果关系审查是否存在因果关系中断——即新介入行为——例如自然发生的事件、第三方的行为，或原告自身极不合理的行为。只要损害的类型是可合理预见的，即使损害的确切程度不可预见，被告仍须承担责任（The Wagon Mound 案）。
Thin skull rule also applies in tort: a defendant must compensate for the full extent of the claimant’s injury even if a pre-existing condition made them unusually vulnerable (Smith v Leech Brain).
蛋壳脑袋规则在侵权中同样适用：即使原告因预先存在的状况而异常脆弱，被告也必须就伤害的全部程度进行赔偿（Smith v Leech Brain 案）。
10. Contract Formation Formula | 合同成立公式
A binding contract is the cornerstone of commercial and consumer law. The formation process can be distilled into a simple sequence of required ingredients, each governed by a blend of objective assessment and established precedent.
具有约束力的合同是商法及消费者法的基石。合同成立过程可以提炼为一个由必要要素组成的简单序列，每一要素均由客观判断与既定判例共同规制。
Offer + Acceptance + Consideration + Intention to Create Legal Relations = Contract
要约 + 承诺 + 对价 + 设立法律关系的意图 = 合同
An offer is a clear statement of terms on which the offeror is prepared to be bound, as distinct from an invitation to treat (Fisher v Bell). Advertisements, shop displays, and auction notices are generally invitations to treat, while a definite promise, such as a reward notice, can be a unilateral offer (Carlill v Carbolic Smoke Ball). Acceptance must be communicated and unconditional, mirroring the terms of the offer (the mirror image rule). Postal acceptance is complete at the moment of posting (the postal rule), but this can be ousted by the terms of the offer.
要约是表明要约人愿意受约束的清晰条款陈述，区别于要约邀请（Fisher v Bell 案）。广告、商店陈列和拍卖通知通常为要约邀请，而诸如悬赏通告之类的确定允诺则可构成单方要约（Carlill v Carbolic Smoke Ball 案）。承诺必须被传达且无条件，并与要约条款完全一致（镜像规则）。邮寄承诺在投邮时即告完成（投邮规则），但要约条款可排除该规则的适用。
Consideration requires each party to give something of value in the eyes of the law — a benefit to the promisor or a detriment to the promisee. Past consideration is not good consideration, and performance of an existing contractual duty owed to a third party may amount to consideration (Pao On). Intention to create legal relations is presumed in commercial agreements and presumed absent in domestic arrangements, though the presumptions are rebuttable by evidence.
对价要求每一方当事人在法律眼里必须提供有价值之物——要么是允诺人获得利益，要么是受允诺人遭受损害。过去的对价并非有效对价，而履行对第三人所负的既有合同义务可构成对价（Pao On 案）。设立法律关系的意图在商业协议中被推定存在，在家庭安排中被推定为不存在，但这些推定均可通过证据予以推翻。
11. Terms and Breach of Contract | 合同条款与违约
Once a contract is formed
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