📚 Year 12 AQA Law: Quick Reference Guide to Legal Formulae and Principles | AQA 法律：公式与定理速查手册
In AQA Year 12 Law, mastering legal principles often means understanding key 'formulae'—logical frameworks that define liability. From criminal actus reus to negligence duty, these structures help you analyse problem questions effectively. This guide summarises essential legal formulae and principles you must know for your exams.
在 AQA 12 年级法律课程中，掌握法律原则常常意味着理解关键的“公式”——即定义法律责任的逻辑框架。从刑事犯罪的犯罪行为到过失侵权的注意义务，这些结构能帮助你有条理地分析案例题。本手册汇总了你在备考中必须熟悉的重要法律公式与定理。
1. Criminal Liability Formula | 刑事责任公式
In criminal law, to establish guilt, the prosecution must prove beyond reasonable doubt that the defendant committed the actus reus (the physical element) with the required mens rea (mental element), and that no defence applies. This can be summed up as a simple equation:
在刑法中，要确立有罪，控方必须超越合理怀疑地证明被告人实施了犯罪行为（actus reus），具备相应的犯罪意图（mens rea），且不存在任何抗辩理由。这可以概括为一个简单的公式：
Actus Reus + Mens Rea + Absence of Defence = Criminal Liability
All three components must coexist. For example, in a theft, the actus reus is the appropriation of property, and the mens rea is the intention to permanently deprive. If there is an effective defence such as duress, liability will not be imposed.
这三个要素必须同时具备。例如，在盗窃案中，犯罪行为是占有财产，犯罪意图是永久剥夺的意图。如果存在胁迫等有效抗辩，则不会追究责任。
2. Actus Reus: Voluntary Conduct | 犯罪行为：自愿行为
Actus reus comprises the physical element of a crime. Crucially, the defendant's act or omission must be voluntary. Automatism—where the defendant is not in control of their body—negates the actus reus. The law also recognises liability for omissions in limited circumstances, such as where a duty of care exists (e.g., parent–child).
犯罪行为包括犯罪的客观要素。关键的是，被告人的作为或不作为必须是自愿的。自动化症（automatism）——即被告人无法控制自己身体的情形——会否定犯罪行为的存在。法律同样在有限情形下承认不作为的责任，例如存在注意义务时（如父母对子女）。
Consider the case of Hill v Baxter (1958) where it was stated that a driver who is attacked by a swarm of bees is not acting voluntarily. Similarly, an omission to act can satisfy actus reus if there is a duty arising from statute, contract, or a special relationship.
考虑 Hill v Baxter (1958)一案，其中指出，被蜂群袭击的驾驶员并非自愿行为。同样，如果存在制定法、合同或特殊关系产生的义务，不作为可以满足犯罪行为要件。
3. Mens Rea: Key Mental States | 犯罪意图：主要心理状态
Mens rea refers to the defendant's state of mind at the time of the offence. The main types recognised in English law include intention (direct and oblique), recklessness (subjective), knowledge, and negligence. For most serious crimes (e.g., murder), intention is required, while recklessness suffices for many non-fatal offences.
犯罪意图指的是被告人在犯罪时的心理状态。英国法承认的主要类型包括故意（直接故意和间接故意）、轻率（主观轻率）、明知和过失。对于大多数严重犯罪（如谋杀），要求具备故意；而对于许多非致命犯罪，轻率即足够。
The test for oblique (indirect) intention was clarified in R v Woollin (1998): a jury may find intention if death or serious injury was a virtual certain consequence of the defendant's actions, and the defendant appreciated that fact. Subjective recklessness means the defendant consciously took an unjustified risk.
间接故意的判断标准在 R v Woollin (1998) 案中得到澄清：如果死亡或严重伤害是被告人行为的几乎必然结果，且被告人已认识到这一事实，陪审团可据此认定故意。主观轻率意味着被告人意识到了一个不合理的风险并且仍然去冒该风险。
4. Causation: Factual and Legal | 因果关系：事实与法律因果
Causation links the defendant's actus reus to the harm. It has two limbs: factual causation (the 'but for' test) and legal causation (the operating and substantial cause). Both must be established.
因果关系将被告人的犯罪行为与损害结果联系起来。它包含两个方面：事实因果关系（“若非”检验）和法律因果关系（有效且实质的原因）。两者都必须成立。
Factual Causation Formula: But for D's conduct, would the result have occurred? If no → causation satisfied.
In R v White (1910), the defendant put cyanide in his mother's drink, but she died of a heart attack before the poison could work. The 'but for' test failed because she would have died anyway, so he was not liable for murder (only attempted murder). Legal causation requires that the defendant's act was a substantial and operative cause of the harm, as in R v Smith (1959).
在 R v White (1910) 案中，被告在母亲的饮料中下毒，但她因心脏病发作在毒药起效前就已死亡。“若非”检验失败，因为无论如何她都会死亡，因此他不构成谋杀罪（仅构成意图谋杀）。法律因果关系要求被告人的行为是损害的一个实质和起作用的原因，如 R v Smith (1959) 案。
5. Negligence: The Four-Element Formula | 过失侵权：四要件公式
In tort law, negligence is the most common claim. To succeed, a claimant must prove four interlocking elements: duty of care, breach of that duty, factual causation of damage, and that the damage was not too remote. This can be remembered as:
在侵权法中，过失是最常见的诉由。要胜诉，索赔人必须证明四个相互关联的要件：注意义务、违反该义务、损害的事实因果关系以及损害并非过分遥远。可记为：
Negligence Liability = Duty of Care + Breach + Causation + Damage (not too remote)
Each element must be established on the balance of probabilities. The duty of care is determined by the Caparo test or existing precedent; breach is assessed against the reasonable person standard; causation uses the 'but for' test; and remoteness considers whether the type of damage was reasonably foreseeable (The Wagon Mound (No 1)).
每个要件都必须在相对可能性的衡量标准下成立。注意义务根据 Caparo 检验标准或既有判例确定；违反义务依据理性人标准评估；因果关系运用“若非”检验；遥远性则考虑损害类型是否合理可预见（The Wagon Mound (No 1) 案）。
6. Duty of Care: The Caparo Three-Part Test | 注意义务：Caparo 三要素检验
When no established duty situation exists, courts use the Caparo Industries plc v Dickman (1990) test to determine whether a duty of care should be
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