Paragraph grammar
Paragraph grammar controls how themes, subjects, reference chains and tense choices develop one central proposition across sentences.
01 · Concept foundation
Understand the terms before applying the rule
Each term below names a different grammatical object. Open examples and compare their function rather than memorising a Vietnamese translation alone.
theme/θiːm/
đề ngữThe point of departure of a clause, often realized by its initial constituent.
In coastal cities, flood risk is increasing.
Ở các thành phố ven biển, rủi ro ngập đang tăng.
rheme/riːm/
thuyết ngữThe part of the clause that develops new information about the theme.
... flood risk is increasing.
... rủi ro ngập đang tăng.
topic sentence/ˈtɒpɪk ˈsentəns/
câu chủ đềA sentence stating the controlling idea that the rest of a paragraph develops.
One major consequence of urbanization is increased runoff.
Một hệ quả lớn của đô thị hóa là dòng chảy mặt tăng.
Complete lesson scope
Do not stop at one formula
Topic sentences, support and concluding movement
Theme-rheme progression across sentences
Reference chains, lexical repetition and tense control
Given-new order, paragraph unity and information flow
Decision boundary: A paragraph is grammatical when its sentences form a recoverable sequence, not merely when each sentence is correct in isolation.
02 · Controlling rule
A paragraph is a controlled sequence of sentence functions, not a container of sentences on a broad topic. A topic sentence establishes the controlling idea; development sentences explain, exemplify, compare, justify or qualify it; reference and lexical chains maintain continuity; tense follows the discourse purpose; the final sentence may synthesise or state an implication. English academic writing generally announces the controlling idea earlier and uses explicit subjects more consistently than Vietnamese prose, where context and delayed development may carry more of the relationship.
controlling claim → explanation/evidence → interpretation/qualification → implication or synthesisParagraph grammar: turn correct sentences into a controlled argument
Organise topic, support, evidence, explanation, counterpoint and closure through sentence function, thematic progression, reference, tense control and genre-aware paragraph architecture.
Paragraph purpose → sentence function → information flow → cohesion check
A paragraph is not a container for sentences. It is a sequence of grammatical choices that manages one controlling idea. Cohesion connects the sequence; reasoning gives it coherence.
What single controlling idea should the reader retain from this paragraph?
What function does each sentence perform: claim, reason, evidence, example, explanation, counterpoint or implication?
How does each sentence connect to the previous sentence and add new information?
Does tense, reference and register remain stable unless a meaningful shift occurs?
1. Assign a function to every sentence
A strong paragraph contains sentences with complementary jobs rather than six versions of the same general statement.
topic/claim → reason → evidence/example → explanation → implication/qualificationA topic sentence states the controlling idea at an appropriate level of generality.
Evidence must be interpreted; a statistic or example alone does not explain why it supports the claim.
A counterpoint should be answered, limited or integrated rather than merely mentioned.
Urban tree cover can reduce heat exposure in dense neighbourhoods. Trees provide shade and cool the air through evapotranspiration. In one district, streets with mature canopy recorded lower afternoon surface temperatures. This difference suggests that targeted planting can complement other heat-adaptation measures.
Độ phủ cây đô thị có thể giảm phơi nhiễm nhiệt ở khu dân cư dày đặc. Cây tạo bóng râm và làm mát không khí qua thoát hơi nước. Tại một quận, các tuyến phố có tán cây trưởng thành ghi nhận nhiệt độ bề mặt buổi chiều thấp hơn. Khác biệt này cho thấy trồng cây có mục tiêu có thể bổ trợ các biện pháp thích ứng nhiệt khác.
The sequence moves from claim to mechanism, evidence and cautious implication.
A higher value was observed. This is good. It is important. Therefore, cities should act.
Quan sát thấy giá trị cao hơn. Điều này tốt. Nó quan trọng. Vì vậy, các thành phố nên hành động.
The sentences are grammatical but their functions are vague, evidence is uninterpreted and the conclusion is unsupported.
Argument paragraph
claim → reason/mechanism → evidence/example → explanation → qualificationDevelop one defensible position.
Claim. This is because.... For example.... This shows.... However....
- The exact order may vary, but every sentence needs a function.
Task 1 detail paragraph
grouped feature → quantified comparison → exception/contrastReport and compare visual data objectively.
A and B rose, with A increasing more sharply. By contrast, C remained stable.
- Do not invent causes unless the visual or prompt supplies them.
Spoken answer chain
direct answer → reason → concrete example → reflectionExtend an answer naturally and coherently.
Yes, I do, mainly because.... For instance.... So overall....
- Use light transitions and natural intonation rather than essay-like labels.
Linear progression
A→B; B→C; C→DExplain a process or causal chain.
The storm caused overtopping. This overtopping damaged the road. The damage delayed evacuation.
- Each repeated element must be unambiguous and meaningful.
Sentence correctness versus paragraph control
Five correct but unrelated sentences
Local grammar is acceptable, but no controlling idea or progression exists.
A claim, evidence, explanation and qualification
Each sentence contributes to one recoverable line of reasoning.
Evaluate paragraphs by sentence function and progression, not sentence accuracy alone.
Topic sentence versus detail
Public transport improves urban accessibility.
A general controlling claim suitable for development.
Bus route 12 carried 18,240 passengers in May.
A specific detail that needs a larger paragraph purpose.
Use the topic sentence to frame why the details matter.
Delayed thesis versus early controlling idea
Context and examples first, main point later
Can be natural in some Vietnamese rhetorical contexts.
Controlling idea early, then support
Common expectation in English academic and IELTS paragraphs.
Make the paragraph purpose visible early unless the genre deliberately uses delayed reveal.
Shared logic
Both English and Vietnamese paragraphs require topic continuity, relevant support and logical movement.
Structural difference
Vietnamese rhetorical writing may tolerate a longer lead-in or delayed thesis; English academic and IELTS writing often expects the controlling point early and explicit grammatical subjects in each clause.
Transfer risk
Direct transfer can create a paragraph whose main point appears too late, whose subjects are omitted, or whose examples are relevant culturally but not explicitly linked grammatically.
Learning strategy
State the paragraph's controlling idea early, keep subjects and reference explicit, and explain how each example supports the claim.
Everyday explanation
- Prefer
- Use a direct point, one reason and one concrete example.
- Avoid
- Avoid long prefatory context before the main point when the listener needs a quick answer.
- Why
- Spoken turns are limited and interactive.
IELTS Speaking
- Prefer
- Answer first, support with a reason and example, then reflect or qualify.
- Avoid
- Avoid a list of disconnected high-level sentences.
- Why
- Coherent extension supports fluency and listener comprehension.
IELTS Writing
- Prefer
- Give each paragraph one controlling function and develop it with relevant support.
- Avoid
- Avoid one-sentence paragraphs, unrelated examples and mechanical linker chains unless a deliberate style justifies them.
- Why
- Paragraphing makes task response and progression visible.
Research and technical reports
- Prefer
- Align paragraph function with section purpose: method, result, interpretation, limitation or implication.
- Avoid
- Avoid mixing result, speculation and recommendation without signalling the shift.
- Why
- Readers need to distinguish observation from interpretation and action.
Paragraph architecture console
Select the target genre and inspect the functional sequence that best supports it.
Select one discourse choice to inspect its effect.
Sentence functions in a paragraph
A sentence may perform more than one function, but its main contribution should be identifiable.
| Function | Question answered | Typical language |
|---|---|---|
| Claim/topic | What is this paragraph arguing or describing? | X can...; One major factor is... |
| Reason/mechanism | Why or how? | because; this occurs when; by + V-ing |
| Evidence/example | What supports the claim? | for example; data from; one case |
| Interpretation | Why does the evidence matter? | this suggests; this means; therefore |
| Qualification | What limit or exception remains? | however; although; under these conditions |
Genre-aware paragraph architectures
These are flexible functional sequences, not memorised sentence templates.
| Context | Useful sequence | Main risk |
|---|---|---|
| IELTS Speaking | answer → reason → example → reflection | memorised disconnected sentences |
| Task 1 detail | group → compare → quantify → exception | invented causes |
| Task 2 body | claim → reason → example → explanation → qualification | example without interpretation |
| Research results | result → pattern → uncertainty → implication | mixing observation and speculation |
✕ There are many things to consider. For example, transport is important.
✓ Reliable public transport improves access to employment by reducing travel time and uncertainty.
The corrected topic sentence states a specific controlling idea that can be developed.
✕ Public parks improve health. For example, Central Park is in New York.
✓ Public parks can support physical activity; for example, safe walking paths give residents a convenient place to exercise.
The example must illustrate the mechanism or claim, not merely mention a related object.
✕ The team collected the samples and analyses them in the laboratory.
✓ The team collected the samples and analysed them in the laboratory.
One completed event sequence requires a consistent past reference frame.
✕ Furthermore, public transport is important.
✓ Public transport can widen access to employment. Reliable services reduce travel uncertainty, especially for workers living far from major job centres.
A paragraph normally develops a controlling idea rather than presenting one isolated sentence.
Choose by communicative purpose and discourse effect
1. Which sequence best develops an argument paragraph?
2. What should follow a statistic or example?
3. Which tense shift is motivated?
4. What is the main purpose of a topic sentence?
Build one four-sentence IELTS Speaking response and one five-sentence IELTS Writing paragraph on the same topic. Label each sentence function, then revise reference, tense and progression.
The paragraph has one controlling idea.
Every sentence has an identifiable function.
Evidence or examples are explicitly interpreted.
Reference and tense shifts are motivated and accurate.
The architecture fits the genre rather than a memorised universal template.
03 · Worked examples
Observe form, function and meaning together
Coastal erosion has accelerated in the study area. Satellite records show that the shoreline retreated at most monitored sites between 2000 and 2025. This pattern was strongest near sediment-starved inlets, suggesting that reduced supply is an important contributing factor. The association, however, does not by itself establish a single cause.
Xói lở bờ biển đã tăng nhanh trong khu vực nghiên cứu. Hồ sơ vệ tinh cho thấy đường bờ lùi tại phần lớn vị trí quan trắc từ năm 2000 đến 2025. Mẫu này mạnh nhất gần các cửa bị thiếu bùn cát, cho thấy nguồn cung suy giảm là một yếu tố góp phần quan trọng. Tuy nhiên, riêng mối liên hệ này chưa xác lập một nguyên nhân duy nhất.
I think online learning is useful for working adults. The main reason is that it lets them study around their jobs. For example, a parent can watch a recorded lecture after the children are asleep. That flexibility is probably its greatest advantage.
Tôi cho rằng học trực tuyến hữu ích với người đi làm. Lý do chính là họ có thể học quanh lịch làm việc. Chẳng hạn, cha mẹ có thể xem bài giảng ghi hình sau khi con ngủ. Tính linh hoạt đó có lẽ là lợi thế lớn nhất.
Overall, all four categories increased, although the rates differed. Category A rose steadily, whereas Category B remained stable until 2015 before climbing sharply. By contrast, Categories C and D showed only modest growth. The most notable feature is therefore the late surge in Category B.
Nhìn chung, cả bốn nhóm đều tăng dù tốc độ khác nhau. Nhóm A tăng đều, trong khi nhóm B ổn định đến năm 2015 rồi tăng mạnh. Trái lại, nhóm C và D chỉ tăng nhẹ. Vì vậy, đặc điểm nổi bật nhất là sự tăng vọt muộn của nhóm B.
The proposed adaptation may reduce short-term flood exposure. Its effectiveness, however, depends on maintenance, local drainage capacity and future sea-level rise. These constraints should therefore be evaluated before the measure is adopted at scale.
Biện pháp thích ứng được đề xuất có thể làm giảm phơi nhiễm ngập trong ngắn hạn. Tuy nhiên, hiệu quả của nó phụ thuộc công tác bảo trì, năng lực thoát nước địa phương và mực nước biển trong tương lai. Vì vậy, các giới hạn này cần được đánh giá trước khi biện pháp được áp dụng trên quy mô lớn.
04 · High-risk contrast
Explain why one form fails, not only which answer is correct
Public transport is important. Moreover, it reduces traffic. Moreover, it is cheaper. Moreover, people can travel safely.
Public transport is important because it can reduce congestion and lower travel costs. These benefits are especially valuable in densely populated cities, where a reliable network can also improve access to work and education.
The original paragraph repeats a sentence-initial linker without building a hierarchy of ideas. The revision groups related evidence, uses a reference phrase and develops the controlling claim from reason to broader implication.
05 · Mastery check
Apply the rule before marking the lesson complete
Which sentence is grammatically acceptable in the target system?
Which description best defines “theme”?
Which example is one of the verified target patterns in this lesson?
Which structural formula belongs to this lesson?
Complete all four checks, then submit a sentence for target-form feedback.
06 · IELTS Academic
Transfer grammar into a real communicative task
In Speaking Part 2 and Part 3, use a compact spoken paragraph: answer, reason, example and reflection. In Writing Task 1, group data by meaningful patterns rather than listing every figure. In Task 2, each body paragraph should advance one controlling claim with evidence and qualification. Mechanical linking cannot compensate for weak progression or irrelevant detail.
Identify the function of every sentence in a paragraph.
Keep one controlling idea while allowing evidence, counterpoint and qualification.
Use tense and reference consistently across sentence boundaries.
Produce distinct spoken, Task 1, Task 2 and research paragraph structures.