语法讲解
定语从句（relative clauses）用来修饰名词或代词。核心在于：
- 选择合适的关系词（关系代词或关系副词），使先行词与从句关系明确、语体得体。
- 在合适条件下进行“简化”（省略关系词或把从句改为简化结构），提升表达的简洁度与专业度，尤其适用于商务写作。
关系词类型与功能：
- 关系代词：who/whom（人）、whose（所属关系）、which（事物/概念）、that（人或物，常用于限定性从句）。
- 关系副词：where（地点=in/at which）、when（时间=in/on/at which）、why（原因=for which），以及正式语体中的 whereby（凭此，由此）、wherein（在其中）。
限定性与非限定性：
- 限定性（无逗号）：限定先行词的范围，是信息必要成分；商务写作中更常见。
- 非限定性（有逗号，常用which/who）：补充说明，不能用that，不可简化为分词结构。
选择要点（实用准则）：
- 人：
- 主语：who 或 that（The manager who/that leads the team…）
- 宾语：who/whom/that（现代商务写作多用 who 或 that；介词前置时用 whom：the client to whom I spoke）
- 物/概念：which 或 that（限定性从句美式商务文体更偏向 that；非限定性从句用 which 且加逗号）
- 所属关系：whose 可用于人或物（a company whose revenue grew）
- 地点：where = in/at which（更正式：in which；抽象名词如 case/situation/point 也可接 where）
- 时间：when = in/on/at which（具体日期常用 on/in which 更精确）
- 原因：why = for which；或直接用 the reason (why/that)；避免 the reason is because 的搭配
- that 常用场景：最高级、序数词、only/all/any/everything/something/the same 等后面（the only option that…）
- 介词位置：口语或一般书面可后置（the team we worked with），正式文书可前置（the team with which we worked）
简化（reduction）原则：
- 省略关系代词：当其作宾语（动词或介词的宾语且介词后置）时可省（the report (that) we discussed）
- 分词短语：
- 主动进行/一般：V-ing（The team handling the project…）
- 被动：V-ed（The issues raised in the meeting…）
- 先于主句：having + V-ed（The tasks, having been reviewed, were approved）
- be 动词省略：当从句是“关系代词 + be + 表语/介词短语”时可省略 be（the files (that are) attached; the room (which is) on the 3rd floor）
- 不可简化：非限定性从句；非共享主语；简化后歧义明显时
常见文体偏好（商务环境）：
- 简洁、明确优先：更倾向限定性从句与恰当的简化
- 正式文档/合同：介词多前置（in which, to whom, by which）与正式副词（whereby, herein, therein）
语法结构
-
基本结构：
- 关系代词：先行词 + who/whom/whose/which/that + 从句
- 关系副词：先行词（时间/地点/原因）+ when/where/why + 从句
-
变化形式：
- 介词位置：the client who I spoke to / the client to whom I spoke
- 副词/介词可互换：the office where we met = the office in which we met
- 时态语态由从句的谓语体现：the plan that was approved; the analyst who will lead
- 分词化：the documents (that are) required → the documents required
-
使用要点：
- that 不用于非限定性从句（逗号后）
- whom 常见于介词前置的正式结构
- whose 可用于非人称名词
- when/where/why 与 in/at/on/for + which 常常等价，正式场合更倾向后者
- 省略与分词化须确保逻辑主语一致、时态关系清晰
实用例句
-
基础例句：
- The supplier who handles our account is on leave.
- The policy that you mentioned has been updated.
- The office where we hold client workshops has moved.
- The quarter when sales peak is Q4.
- The reason why we postponed the launch is budget constraints.
-
进阶例句（商务语境，正式/书面偏好）：
- The client to whom we submitted the proposal requested revisions.
- The contract, which was signed last Friday, takes effect on January 1.
- We are exploring a scenario in which demand exceeds capacity.
- The metrics recorded in the pilot indicate strong product-market fit.
- The board approved the only option that minimized risk.
-
对比例句（正确 vs 常见问题）：
- 正：The team that won the bid will lead implementation.
误：The team which won the bid will lead implementation.（在美式商务文体中，限定性从句更常用 that；并非语法错误，但文体不优）
- 正：The client to whom I spoke agreed. / The client who I spoke to agreed.（均可，前者更正式）
误：The client whom I spoke to agreed.（可用，但现代口语多用 who；whom 更适合介词前置）
- 正：The reason we changed vendors is cost. / The reason why we changed vendors is cost.
误：The reason is because we changed vendors.（冗余搭配）
- 正：The meeting at which we finalized the budget was productive.
亦可：The meeting where we finalized the budget was productive.（where 更口语）
- 正：The company whose revenue grew fastest expanded to Asia.
误：The company which revenue grew fastest…（缺属格；应为 whose）
常见错误
-
错误类型：
- that/which 用法与逗号不匹配
- 误用 where/when/why（用在不表示地点/时间/原因的先行词后）
- 省略关系代词位置不当（主语不可省）
- 分词化导致主语不一致或时态关系混乱
- 介词乱放导致正式度不当
-
错误分析与修正：
- The report, that we discussed, is final. → The report that we discussed is final.（限定性不用逗号，也不用 that 后加逗号）
- The situation where we lack data… → The situation in which we lack data…（抽象名词更稳妥用介词+which）
- The vendor offered a discount we needed.（可）但主语不可省：The vendor who offered a discount…（不能省 who）
- Having reviewed, the proposal was approved.（谁 reviewed 不清）→ Having reviewed the proposal, the committee approved it. 或 The proposal, having been reviewed, was approved.
- The person to which I spoke…（人用 whom/who）→ The person to whom I spoke…
练习题
- 难度分级：从易到难
- 请按指示选择/改写；商业语境优先；注意标点与正式度
A. 选择合适的关系词（who/whom/whose/which/that/where/when/why）
- The analyst ____ will present the forecast joined yesterday.
- The KPI dashboard ____ you shared needs an update.
- The reasons ____ we delayed the launch were external.
- The quarter ____ we typically renegotiate contracts is Q3.
- The office ____ we met last time has been renovated.
- The client to ____ we sent the invoice has paid.
- The firm ____ revenue doubled opened two new branches.
B. 改写为介词+which 或关系副词（两种都写）
8) The market where we operate is highly regulated. → （写出 in which 版本）
9) The date when the policy expires is July 31. → （写出 on which 版本）
10) The reason why we adjusted prices is inflation. → （写出 for which 版本）
C. 省略关系代词（可省则省，不可省则保持）
11) The vendor (that) we contacted responded promptly.
12) The consultant who led the workshop shared all materials.
13) The solution (which) our team proposed was accepted.
14) The clients (whom) we negotiated with agreed to the terms.
D. 分词化（将定语从句改为简化结构）
15) The attachments that are included in the email contain the revised SOW.
16) The issues that were raised during the call will be prioritized.
17) The manager who is responsible for onboarding will contact you.
18) The tasks that were completed last night have been logged.
E. 正式度提升（把介词后置结构改为介词前置）
19) The colleague who I worked with will lead the audit.
20) The partner who we collaborated with on the project is visiting.
F. 错误改正
21) The reason is because the budget was cut.
22) The company which CEO resigned appointed an interim leader.
23) The meeting, that we planned for weeks, was canceled.
G. 进阶应用（选 that/which 并说明是否加逗号）
24) The report ____ was requested by the board is confidential.
25) The report ____, which summarizes Q4 trends, is on your desk.
H. 高阶简化与选择（确保逻辑与时序正确）
26) The first candidate who will present is Mr. Zhao.（改为不定式结构）
27) The documents that are required for onboarding are listed below.（两种简化）
28) The proposal that the client approved yesterday will be implemented next week.（可否省略关系词？如可则省）
— 参考答案 —
A.
- who/that（主语）
- that/which（限定性偏好 that；which 也对）
- why（或 for which；复数 reasons 也可用 that，但 why 更自然）
- when（或 in which/at which；Q3 常用 in which/when）
- where（或 at which/in which）
- whom（介词前置正式）/ who（口语，介词后置 to）
- whose（属格）
B.
8) in which（The market in which we operate…）
9) on which（The date on which the policy expires…）
10) for which（The reason for which we adjusted prices…）
C.
11) 可省：The vendor we contacted…
12) 不可省（主语）：The consultant who led…
13) 可省：The solution our team proposed…
14) 可省（介词后置）：The clients we negotiated with…
D.
15) included（The attachments included in the email…）
16) raised（The issues raised during the call…）
17) responsible for onboarding（The manager responsible for onboarding…）
18) completed last night（The tasks completed last night…）
E.
19) The colleague with whom I worked will lead the audit.
20) The partner with whom we collaborated on the project is visiting.
F.
21) The reason is that the budget was cut. / We postponed because the budget was cut.
22) The company whose CEO resigned appointed an interim leader.
23) The meeting, which we planned for weeks, was canceled.（非限定性说明性信息）
G.
24) that（限定性，无逗号）
25) which（非限定性，需逗号）
H.
26) The first candidate to present is Mr. Zhao.
27) - required for onboarding（The documents required for onboarding…）
- that are 省略 be：同上；或 The documents needed for onboarding…
28) 可省：The proposal the client approved yesterday will be implemented next week.（关系代词作宾语，省略可）
— 实用提示（商务沟通） —
- 邮件标题/要点中优先简洁：Documents required for onboarding; Client issues raised during UAT
- 合同/政策文本偏正式：the terms to which the parties agree; the process whereby disputes are resolved
- 优先避免歧义：当 where/when/why 可能模糊，改用 in/on/for which
- 保持一致性：同一文档内对 that/which 的限定性/非限定性用法保持一致风格
如需，我可以根据你的公司邮件/报告样本，定制化改写为更正式或更精简的定语从句与简化结构。
