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AI 英语语法知识库
时态
Tenses
9
一般现在时
Simple Present Tense
一般将来时
Simple Future Tense
一般过去时
Simple Past Tense
现在完成时
Present Perfect Tense
现在完成进行时
Present Perfect Continuous Tense
过去完成时
Past Perfect Tense
现在进行时
Present Continuous Tense
过去进行时
Past Continuous Tense
将来进行时
Future Continuous Tense
从句
Clauses
7
定语从句
Relative Clauses
名词性从句
Noun Clauses
状语从句
Adverbial Clauses
宾语从句
Object Clauses
主语从句
Subject Clauses
同位语从句
Appositive Clauses
条件状语从句
Conditional Clauses
非谓语动词
Non-finite Verbs
6
动名词
Gerunds
不定式
Infinitives
现在分词
Present Participles
过去分词
Past Participles
非谓语作主语
Non-finite as Subject
非谓语作状语
Non-finite as Adverbial
句子结构
Sentence Structures
4
主谓宾结构
SVO Structure
并列句
Compound Sentences
复合句
Complex Sentences
平行结构
Parallel Structures
学术写作
Academic Writing
5
正式语气
Formal Tone
避免口语化
Avoiding Informal Language
学术句型
Academic Sentence Patterns
段落结构
Paragraph Structure
论证表达
Argumentative Structures
PTE 高频语法
PTE Grammar Patterns
4
Essay 高频句型
Essay Structures
SST 学术句型
SST Academic Structures
WFD 高频结构
WFD Sentence Patterns
Speaking 常用表达
Speaking Structures
从句
Clauses
Upper-intermediate to Advanced
同位语从句
Appositive Clauses
同位语从句是用来解释、说明或具体展开某个抽象名词内容的名词性从句,常跟在 fact, idea, belief, claim, evidence, possibility, assumption, conclusion, question, problem, news, decision 等名词之后。它的核心作用不是修饰名词的性质,而是说明“这个名词具体指什么内容”。在 PTE Academic 和 IELTS 写作、阅读、听力中,同位语从句常用于表达研究结论、观点、证据、争议和可能性,是提高学术表达准确性的重要语法结构。最常见的引导词是 that,此外还包括 whether, why, how, when, where 等。需要特别注意:同位语从句中的 that 一般不作成分,只起连接作用,且在正式学术写作中通常不省略。
核心语法结构
Grammar Formula
抽象名词 + appositive clause:Noun + that / whether / why / how / when / where + 完整句子
PTE 高频程度
High
AI 学习推荐
Core Grammar
适用考试
PTE / IELTS
语法结构
Grammar Structure
结构公式
抽象名词 + appositive clause:Noun + that / whether / why / how / when / where + 完整句子
同位语从句通常位于一个抽象名词之后,对该名词的内容进行具体解释。例如在 the fact that climate change is accelerating 中,that climate change is accelerating 不是修饰 fact 的特征,而是直接说明“事实”的具体内容。与定语从句不同,同位语从句中的 that 不在从句中充当主语、宾语或状语;而定语从句中的 that / which / who 通常在从句中充当句子成分。学术英语中,同位语从句常与表示观点、证据、结论、问题、可能性、决定和假设的名词搭配,用于构建更加严谨的论证句。
The fact that many students struggle with time management is widely recognised.
许多学生在时间管理方面存在困难这一事实已被广泛认可。
There is growing evidence that regular exercise improves cognitive performance.
越来越多的证据表明,规律运动能提高认知表现。
The question whether online education can replace traditional classrooms remains controversial.
在线教育是否能取代传统课堂这一问题仍然具有争议。
Researchers have reached the conclusion that early intervention is essential.
研究人员得出了早期干预至关重要这一结论。
使用场景
Usage Scenarios
解释抽象名词的具体内容
当一个名词本身含义较抽象,需要后面用完整句子说明其具体内容时,可以使用同位语从句。这类结构在学术写作中非常常见,尤其适合说明 fact, idea, claim, belief, assumption, conclusion 等名词。
The idea that technology can solve every social problem is overly simplistic.
技术能够解决所有社会问题这一想法过于简单化。
The assumption that economic growth always leads to social equality is questionable.
经济增长总是会带来社会平等这一假设是值得质疑的。
表达研究发现、证据和结论
在 PTE Summarize Written Text、Essay Writing 和 IELTS Task 2 中,同位语从句可以帮助考生更自然地呈现研究结果、数据推论或学术观点,使句子更加正式、清晰。
Recent studies support the claim that bilingual education enhances mental flexibility.
近期研究支持双语教育能够增强思维灵活性这一观点。
The evidence that air pollution affects children's health is difficult to ignore.
空气污染影响儿童健康这一证据是难以忽视的。
提出争议性问题或不确定性
当表达“是否”“为什么”“如何”等问题时,同位语从句可以跟在 question, issue, problem, uncertainty, doubt 等名词之后。这类表达常用于讨论型作文和阅读文本中的观点转折。
The issue whether governments should subsidise public transport deserves careful consideration.
政府是否应该补贴公共交通这一问题值得仔细考虑。
The question why some students perform better under pressure remains unresolved.
为什么一些学生在压力下表现更好这一问题仍未得到解决。
用于正式写作中的观点展开
同位语从句可以把简单观点扩展成更有逻辑的学术句式,适合用于 IELTS Writing Task 2 的主体段和 PTE Essay 的论证部分。
The belief that higher salaries automatically improve job satisfaction fails to consider workplace culture.
高薪会自动提高工作满意度这一看法没有考虑到职场文化。
The argument that stricter laws can reduce traffic accidents is supported by statistical data.
更严格的法律能够减少交通事故这一论点得到了统计数据的支持。
常见错误
Common Mistakes
Incorrect
❌ The fact which many people work from home has changed cities.
Correct
✅ The fact that many people work from home has changed cities.
这里从句是在说明 fact 的具体内容,而不是修饰 fact 的性质,因此应使用同位语从句连接词 that,不能用 which。which 通常用于定语从句,并且在从句中充当成分。
Incorrect
❌ There is no doubt the education is important.
Correct
✅ There is no doubt that education is important.
在正式学术写作中,no doubt 后的同位语从句通常保留 that。虽然口语中有时可省略 that,但在 IELTS 和 PTE 写作中保留 that 更清晰、更正式。
Incorrect
❌ The idea that should students study abroad is popular.
Correct
✅ The idea that students should study abroad is popular.
同位语从句使用陈述语序,即主语 + 谓语。不能因为从句中含有 should 就使用疑问倒装语序。中文学习者常受中文“是否应该”的语序影响而误用倒装。
Incorrect
❌ The question that whether online learning is effective remains open.
Correct
✅ The question whether online learning is effective remains open.
whether 已经可以引导同位语从句,前面不需要再加 that。that whether 连用在这里是错误结构。
Incorrect
❌ The evidence that supports the theory is convincing. 误认为这是同位语从句。
Correct
✅ The evidence that the theory is valid is convincing.
The evidence that supports the theory 中的 that 在从句中作主语,属于定语从句,意思是“支持该理论的证据”。The evidence that the theory is valid 才是同位语从句,意思是“该理论有效这一证据”。
Incorrect
❌ I agree the claim that university should free.
Correct
✅ I agree with the claim that university education should be free.
agree with the claim 是固定搭配;同位语从句内部也必须是完整、语法正确的句子。university education should be free 表达完整,而 university should free 缺少正确的形容词或被动结构。
学术表达
Academic Patterns
There is evidence that + clause.
有证据表明……
The fact that + clause + suggests that + clause.
……这一事实表明……
The assumption that + clause + is problematic.
……这一假设是有问题的。
The claim that + clause + is supported by evidence.
……这一说法得到了证据支持。
The possibility that + clause + cannot be dismissed.
……这一可能性不能被排除。
The conclusion that + clause + is based on recent findings.
……这一结论基于近期发现。
The belief that + clause + has been challenged.
……这一看法受到了质疑。
The question whether + clause + remains controversial.
是否……这一问题仍然存在争议。
The issue of whether + clause + requires further discussion.
是否……这一问题需要进一步讨论。
The argument that + clause + overlooks + noun phrase.
……这一论点忽视了……
PTE 高频应用
PTE Usage
同位语从句在 PTE Academic 中出现频率较高,尤其常见于 Reading & Writing: Fill in the Blanks、Re-order Paragraphs、Summarize Written Text、Write Essay、Listening: Summarize Spoken Text 和 Highlight Incorrect Words。PTE 学术文本经常使用 the fact that, the idea that, evidence that, the possibility that, the assumption that 等结构来表达观点和研究发现。考生需要识别同位语从句的边界,判断 that 是否只是连接词,并在写作中用它来压缩信息、提升句子复杂度和学术性。
Reading & Writing: Fill in the Blanks
Re-order Paragraphs
Summarize Written Text
Write Essay
Listening: Summarize Spoken Text
Highlight Incorrect Words
高频搭配
Common Collocations
the fact that
……这一事实
the idea that
……这一想法
the belief that
……这一信念;……这一看法
the claim that
……这一说法;……这一主张
the evidence that
……这一证据
the possibility that
……这一可能性
the assumption that
……这一假设
the conclusion that
……这一结论
the argument that
……这一论点
the question whether
是否……这一问题
the issue whether
是否……这一议题
the decision that
……这一决定
AI 学习建议
AI Learning Tips
判断同位语从句时,先看前面的名词是否是抽象名词,再看后面的从句是否在解释这个名词的具体内容。
在 PTE 和 IELTS 写作中,优先使用 the fact that, evidence that, the claim that, the possibility that 这类高频学术结构。
不要把所有 noun + that 都判断为同位语从句;如果 that 在从句中作主语或宾语,它更可能是定语从句。
同位语从句内部必须使用陈述语序,不能使用疑问句语序。
正式写作中尽量不要省略引导同位语从句的 that,因为保留 that 可以增强句子结构的清晰度。
AI 练习题
Practice Questions
判断下列句子中的 that 从句是否为同位语从句:The news that the government will increase education funding surprised many parents.
答案:是同位语从句。that the government will increase education funding 解释 news 的具体内容,即“政府将增加教育经费”这一消息。
改错:The belief which hard work always leads to success is common.
答案:正确句子:The belief that hard work always leads to success is common. 这里从句解释 belief 的内容,应使用 that 引导同位语从句。
用同位语从句翻译:越来越多的证据表明,睡眠不足会影响学习效率。
答案:There is growing evidence that lack of sleep affects learning efficiency.
选择正确答案:The question ___ artificial intelligence will replace human workers remains debated. A. that B. whether C. which
答案:B. whether。句意为“人工智能是否会取代人类工人这一问题仍有争议”。whether 用于引导表示“是否”的同位语从句。
将简单句合并为含有同位语从句的学术句:Many people believe this. Public transport should be free.
答案:Many people hold the belief that public transport should be free.
判断句子类型:The theory that explains this phenomenon is widely accepted.
答案:这不是同位语从句,而是定语从句。that 在从句中作主语,修饰 the theory,意思是“解释这一现象的理论”。
把句子补充完整:The possibility that remote work may reduce office costs __________.
答案:示例答案:The possibility that remote work may reduce office costs has attracted considerable attention from employers.
用更学术的方式改写:It is true that social media influences young people.
答案:The fact that social media influences young people is widely acknowledged.