📚 A-Level CIE Law: Quick Reference Handbook of Formulas & Theorems | A-Level CIE 法律：公式定理速查手册
This handbook distils core legal principles, tests, and definitions from the CIE A-Level Law syllabus into concise ‘formulas’ and ‘theorems’. Each entry is presented as an equation or structured test to help you memorise and apply key legal rules in contract, tort, and criminal law.
本手册将 CIE A-Level 法律课程中的核心法律原则、测试和定义浓缩为简洁的“公式”与“定理”。每一个条目都以等式或结构化测试的形式呈现，帮助你在合同法、侵权法和刑法中记忆并应用关键法律规则。
1. Contract Formation Formula | 合同成立公式
Offer + Acceptance + Consideration + Intention to Create Legal Relations = Valid Contract
An offer is a definite promise to be bound on specific terms, made with the intention that it will become binding immediately upon acceptance (Carlill v Carbolic Smoke Ball Co).
要约是一项明确承诺，表示愿意受特定条款约束，并有意在对方承诺后立即产生约束力（Carlill v Carbolic Smoke Ball Co案）。
Acceptance must be an unqualified mirror image of the offer and must be communicated to the offeror; silence cannot amount to acceptance (Felthouse v Bindley).
承诺必须是无条件的、与要约内容一致的镜像，并且必须传达给要约人；沉默不构成承诺（Felthouse v Bindley案）。
Consideration is the ‘price’ for which the promise is bought; it must move from the promisee, be sufficient but need not be adequate, and must not be past (Currie v Misa).
对价是换取承诺的“代价”；对价必须来自受诺人，必须充分但无需等价，且不得是过去的对价（Currie v Misa案）。
There must be an intention to create legal relations; in social and domestic arrangements, there is a presumption against intention (Balfour v Balfour), whereas in commercial agreements, there is a strong presumption in favour (Edwards v Skyways Ltd).
必须存在设立法律关系的意图；在社交和家庭安排中，通常推定无意建立法律关系（Balfour v Balfour案），而在商业协议中，则有强有力的意图推定（Edwards v Skyways Ltd案）。
2. Consideration Rules | 对价规则
Sufficient Consideration ≠ Adequate Consideration; Past Consideration = No Consideration
The doctrine of consideration is built on a set of interlocking rules. The following table summarises the key requirements and limitations.
对价制度建立在一系列相互关联的规则之上。下表总结了关键要求与限制。
| Rule (English) | 规则（中文） |
| Consideration must be sufficient but need not be adequate (Thomas v Thomas). | 对价必须充分，但无需等价（Thomas v Thomas案）。 |
| Past consideration is not good consideration (Re McArdle). | 过去的对价不构成有效对价（Re McArdle案）。 |
| Performance of an existing public duty is not valid consideration (Collins v Godefroy). | 履行既存的公共义务不构成有效对价（Collins v Godefroy案）。 |
| Part payment of a debt generally cannot discharge the whole debt (Pinnel’s Case). | 部分清偿债务一般不能免除全部债务（Pinnel案）。 |
| Practical benefit may constitute good consideration if a genuine advantage is conferred (Williams v Roffey Bros). | 如果带来真实利益，实际利益可以构成有效对价（Williams v Roffey Bros案）。 |
3. Negligence Formula | 过失侵权公式
Duty of Care + Breach of Duty + Causation + Damage = Negligence
To succeed in a claim for negligence, a claimant must establish that the defendant owed them a duty of care. The existence of a duty is determined by the Caparo three-stage test.
要在过失侵权中胜诉，原告必须证明被告对其负有注意义务。注意义务的存在由卡帕罗三阶段测试决定。
A breach of duty occurs when the defendant falls below the standard of the reasonable person. The standard is objective, though professional standards are judged by the Bolam test (Bolam v Friern Hospital Management Committee).
当被告的行为未达到合理人的标准时，即构成义务违反。该标准是客观的，但专业标准依据博勒姆测试判断（Bolam v Friern Hospital Management Committee案）。
Causation requires proof of both factual causation (the ‘but for’ test) and legal causation (the damage must not be too remote). The claimant must also have suffered damage that is not too remote (The Wagon Mound).
因果关系要求证明事实因果关系（“若非”测试）和法律因果关系（损害不能过于遥远）。原告还必须遭受了并非过于遥远的损害（The Wagon Mound案）。
4. Caparo Three-Stage Test | 卡帕罗三阶段测试
Foreseeability + Proximity + Fair, Just and Reasonable = Duty of Care (Caparo Industries v Dickman)
Stage 1: Foreseeability of harm – was it reasonably foreseeable that the defendant’s conduct could cause harm to a person in the claimant’s position?
第一阶段：损害的可预见性——被告的行为对处于原告地位的人造成损害是否合理可预见？
Stage 2: Proximity of relationship – is there a close and direct relationship between the claimant and the defendant, based on proximity in time, space, or a prior relationship?
第二阶段：关系的关联性——原告与被告之间是否存在基于时间、空间或先前关系的紧密直接联系？
Stage 3: Fair, just and reasonable – even if foreseeability and proximity are established, the court will consider whether it is fair, just and reasonable to impose a duty, taking into account policy considerations.
第三阶段：公平、公正且合理——即使可预见性和关联性成立，法院仍会考虑施加义务是否公平、公正且合理，并考量政策因素。
The Caparo test is applied incrementally and by analogy to established categories of duty, rather than as a free-standing formula in every novel situation.
卡帕罗测试以渐进和类推已有义务类别的方式适用，而不是在每个新情形中作为独立公式使用。
5. Criminal Liability Equation | 刑事责任等式
Actus Reus + Mens Rea + Absence of Defence = Crime
The actus reus comprises all the external elements of the offence: conduct, any required consequences, and the surrounding circumstances. It must be a voluntary act (Hill v Baxter).
犯罪行为包括罪行的所有外在要素：行为、任何必备结果以及相关情节。它必须是自愿行为（Hill v Baxter案）。
Mens rea is the mental element required for the particular offence, such as intention, recklessness, or negligence. For most serious crimes, either direct intent (aim or purpose) or oblique intent (foresight that a consequence is virtually certain) suffices (R v Woollin).
犯罪意图是特定罪行所要求的主观要素，例如故意、轻率或过失。对于大多数严重犯罪，直接故意（目的）或间接故意（预见结果几乎必然发生）均可成立（R v Woollin案）。
Absence of a valid defence – even if actus reus and mens rea are present, a defendant may escape liability by raising a defence such as self-defence, duress, insanity, or automatism.
缺乏有效辩护——即使存在犯罪行为和犯罪意图，被告仍可通过提出正当防卫、胁迫、精神错乱或自动症等辩护而免于责任。
6. Causation in Criminal Law | 刑法中的因果关系
Factual Causation (‘But For’) + Legal Causation (Substantial and Operative) = Causation Established
Factual causation is established by the ‘but for’ test: but for the defendant’s conduct, would the result have occurred? If the result would not have occurred, factual causation is satisfied (R v White).
事实因果关系通过“若非”测试确定：若非被告的行为，结果是否会发生？如果结果不会发生，则事实因果关系成立（R v White案）。
Legal causation requires that the defendant’s act be a substantial and operative cause of the result. The defendant’s act need not be the sole cause, but must make a more than minimal contribution (R v Smith).
法律因果关系要求被告的行为是结果的实质性和有效原因。被告的行为不必是唯一原因，但必须做出超出最低限度的贡献（R v Smith案）。
An intervening act (novus actus interveniens) may break the chain of causation if it is free, voluntary, and informed, or if it is an abnormal and unexpected event. Medical treatment will only break the chain if it is so palpably wrong that it becomes the sole cause of death (R v Cheshire).
如果介入行为是自由、自愿且知情的，或属于异常且不可预见的，则可能中断因果链条。医疗行为只在明显错误以至于成为死亡唯一原因时才会中断因果关系（R v Cheshire案）。
The thin skull rule provides that the defendant must take the victim as they are found; an unusual physical or psychological vulnerability does not break the chain of causation (R v Blaue).
薄颅骨规则要求被告必须接受被害人的原有状况；异常的生理或心理脆弱性不会中断因果链条（R v Blaue案）。
7. Murder Definition | 谋杀罪定义
Unlawful Killing + Reasonable Creature in Being + Queen’s Peace + Malice aforethought = Murder
The classic common law definition of murder, often attributed to Sir Edward Coke, is: ‘the unlawful killing of a reasonable creature in being under the Queen’s Peace with malice aforethought, express or implied.’
谋杀罪经典普通法定义通常归于爱德华·科克爵士：“非法杀害任何处于女王安宁之下的有理智的人，且怀有明示或默示的恶意预谋。”
‘A reasonable creature in being’ means a human being who has been fully expelled from the mother’s body and has an independent existence (R v Poulton). A foetus is not a reasonable creature in being, but killing a child during birth can amount to murder once the child has fully emerged.
“有理智的人”指已完全脱离母体且独立存活的人类（R v Poulton案）。胎儿不是有理智的人，但一旦婴儿完全出生后将其杀害，可构成谋杀。
Malice aforethought means an intention to kill (express malice) or an intention to cause grievous bodily harm (implied malice) (R v Vickers). It does not require premeditation; even a momentary intent formed at the time of the killing is sufficient.
恶意预谋指故意杀人（明示恶意）或故意造成严重身体伤害（默示恶意）（R v Vickers案）。预谋并非必须；即使在杀人瞬间形成的意图也足以构成。
8. Theft Act 1968 Formula | 1968年盗窃法公式
Dishonest Appropriation + Property + Belonging to Another + Intention to Permanently Deprive = Theft
Under section 1(1) of the Theft Act 1968, a person is guilty of theft if they dishonestly appropriate property belonging to another with the intention of permanently depriving the other of it.
根据《1968年盗窃法》第一条第一款，任何人以不诚实方式侵占属于他人的财产，且具有永久剥夺他人该财产的意图，即构成盗窃罪。
‘Appropriation’ means assuming the rights of the owner; it can occur even with the consent of the owner if that consent is obtained by deception (R v Gomez).
“侵占”指行使所有者的任何权利；即使取得所有者同意，若该同意系通过欺骗获取，仍可构成侵占（R v Gomez案）。
‘Dishonesty’ is now assessed according to the objective test in Ivey v Genting Casinos: the fact-finder must first ascertain the defendant’s actual state of knowledge or belief as to the facts, and then determine whether their conduct was dishonest by the standards of ordinary decent people.
“不诚实”现依据Ivey v Genting Casinos案中的客观标准判断：事实认定者须先确定被告对事实的真实认知或信念，然后按普通正直人的标准判定其行为是否不诚实。
‘Intention to permanently deprive’ includes cases where the defendant treats the property as their own to dispose of regardless of the owner’s rights; temporary borrowing may suffice if the taking is equivalent to outright taking (R v Lloyd).
“永久剥夺的意图”包括被告将财产视为己物而处分、不顾所有者权利的情形；如果取得行为等同于彻底拿走，短暂借用也可能满足该要求（R v Lloyd案）。
9. Strict Liability Formula | 严格责任公式
Actus Reus alone (no Mens Rea required for at least one element) = Strict Liability Offence
Strict liability offences require proof only of the actus reus; no mens rea is needed in respect of at least one element. These are typically regulatory or public welfare offences, such as selling alcohol to a minor.
严格责任犯罪仅需证明犯罪行为，至少对某一要素不要求犯罪意图。此类犯罪通常属于监管或公共福利类犯罪，如向未成年人售酒。
The presumption of mens rea is displaced where the statute relates to an issue of social concern, the offence carries a light penalty, and Parliament clearly intended strict liability (Gammon (Hong Kong) Ltd v Attorney-General).
当法律涉及社会公共利益问题、处罚较轻且议会明确表达严格责任意图时，犯罪意图推定即被推翻（Gammon (Hong Kong) Ltd v Attorney-General案）。
Due diligence is generally not a defence to a strict liability offence unless the statute expressly provides for it; however, some limited defences like the ‘third party’ defence in the Licensing Act may apply.
一般而言，尽到勤勉义务并非严格责任犯罪的辩护理由，除非法律有明确规定；但某些有限的辩护，如《许可法》中的“第三方”辩护可能适用。
Key examples include: selling contaminated food (Callow v Tillstone), supplying unauthorised medicinal products (Pharmaceutical Society of Great Britain v Storkwain), and causing pollution under environmental statutes.
关键案例包括：出售受污染食品（Callow v Tillstone案）、供应未经授权的医疗产品（Pharmaceutical Society of Great Britain v Storkwain案），以及根据环境法规造成的污染。
10. Contract Term Classification | 合同条款分类
Condition (Right to Terminate + Damages) ≠ Warranty (Damages Only) ≠ Innominate Term (Depends on Consequences)
Terms of a contract are classified according to their importance and the effect of a breach. A condition is a fundamental term, any breach of which entitles the innocent party to terminate the contract and claim damages (Poussard v Spiers).
合同条款根据其重要性及违反后果分类。条件条款是根本性条款，任何违反都赋予无过错方终止合同并索赔的权利（Poussard v Spiers案）。
A warranty is a minor term; a breach of warranty only gives rise to a claim for damages, not the right to terminate the contract (Bettini v Gye).
保证条款是次要条款；违反保证条款仅可提起损害赔偿，而不能终止合同（Bettini v Gye案）。
An innominate or intermediate term is one which cannot be classified as a condition or a warranty in advance. The remedy depends on the seriousness of the breach: if the breach deprives the innocent party of substantially the whole benefit of the contract, the right to terminate arises; otherwise only damages are available (Hong Kong Fir Shipping Co Ltd v Kawasaki Kisen Kaisha Ltd).
中间条款是指无法预先归类为条件或保证的条款。救济方式取决于违反的严重程度：若违反实质上剥夺了无过错方在合同中的全部利益，则产生终止权；否则仅可主张损害赔偿（Hong Kong Fir Shipping案）。
The courts may also identify terms as ‘fundamental’ when they go to the root of the contract, but the classification approach in Hong Kong Fir has largely replaced rigid application of that label in commercial disputes.
当条款触及合同根基时，法院也可能将其定性为“根本条款”，但在商业争议中，Hong Kong Fir案的分类方法已在很大程度上取代了对该标签的僵化适用。
11. Offer v Invitation to Treat | 要约与要约邀请
Offer = Definite Promise; Invitation to Treat = Invitation to Negotiate (no immediate contract)
An offer is a clear, unequivocal statement of the terms on which the offeror is willing to be bound; an invitation to treat is merely an invitation to enter into negotiations or to make an offer.
要约是对于要约人愿意受约束的条款的明确、不含糊的陈述；要约邀请仅仅是邀请对方进行谈判或发出要约。
Goods displayed in a shop window or on a shelf are generally invitations to treat; the customer makes an offer when they present the item at the counter, and acceptance occurs when the shopkeeper accepts payment (Pharmaceutical Society of Great Britain v Boots Cash Chemists).
橱窗陈列或货架上的商品通常属于要约邀请；顾客在柜台出示商品时为发出要约，店主接受付款时构成承诺（Pharmaceutical Society of Great Britain v Boots案）。
Advertisements are usually invitations to treat (Partridge v Crittenden), but can amount to an offer if they amount to a clear unilateral promise, such as the advertisement in Carlill v Carbolic Smoke Ball Co.
广告通常属于要约邀请（Partridge v Crittenden案），但若构成明确的单方允诺，则可视为要约，如Carlill v Carbolic Smoke Ball Co案中的广告。
Requests for information and statements of price are also not offers; the distinction is crucial because only an offer can be accepted to form a binding contract.
询价和报价声明同样不属于要约；这一区分至关重要，因为唯有要约可被承诺从而形成有约束力的合同。
12. Voluntary Manslaughter Defences | 自愿误杀辩护
Murder Actus Reus & Mens Rea + Partial Defence = Voluntary Manslaughter
Voluntary manslaughter arises where a defendant would otherwise be guilty of murder, but a recognised partial defence reduces the conviction to manslaughter. The three main partial defences are: loss of control, diminished responsibility, and suicide pact.
自愿误杀出现于被告本可构成谋杀罪，但因得到认可的局部辩护而将定罪减轻为误杀的情形。三种主要的局部辩护是：失去控制、减弱责任能力和自杀协议。
The defence of loss of control (replacing the old provocation defence) requires the defendant to show that they lost self-control due to a qualifying trigger, and that a person of the defendant’s sex and age, with a normal degree of tolerance and self-restraint, might have reacted in a similar way (Coroners and Justice Act 2009, s 54–55).
失去控制辩护（取代了旧有的挑衅辩护）要求被告证明其因适格触发事件失去自控能力，且一个与被告同性别、同年龄、具有正常容忍度和自控力的人在相似情况下可能做出类似反应（《2009年验尸官与司法法》第54-55条）。
Diminished responsibility, under s2 of the Homicide Act 1957 as amended, applies where the defendant was suffering from an abnormality of mental functioning arising from a recognised medical condition, which substantially impaired their ability to understand the nature of their conduct, form a rational judgment, or exercise self-control.
根据经修订的《1957年杀人法》第2条，减弱责任能力适用于被告因公认医学状况导致精神功能异常，且该异常实质性削弱了其理解自身行为性质、做出理性判断或进行自我控制的能力。
A suicide pact under s4 of the Homicide Act 1957 provides a partial defence where the defendant killed another in pursuance of a genuine pact, intending to die themselves. These defences operate only to reduce murder to voluntary manslaughter; they are not general defences.
依据《1957年杀人法》第4条，自杀协议若为真实协议且被告有意自行赴死，可提供局部辩护。这些辩护仅将谋杀减轻为自愿误杀，并非一般性辩护理由。
Published by TutorHao | Law Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导