TOEFL Grammar — Complete Reference Guide

Grammar in TOEFL Scoring

TOEFL does not have a dedicated Grammar section. However, grammar is evaluated — implicitly and explicitly — in both the Writing and Speaking sections via two scoring criteria: Grammatical Range (using a variety of structures) and Grammatical Accuracy (using them correctly).

In Writing, the ETS rubric explicitly scores "grammatical range and accuracy." A high-scoring essay uses simple, compound, complex, and compound-complex sentences — not just simple sentences repeated over and over. Scorers (human and AI) penalize repetitive sentence structure even when each sentence is technically correct.

In Speaking, SpeechRater's Language Use criterion evaluates grammatical accuracy and variety. Responses with consistent subject-verb agreement errors, wrong article usage, or tense shifts score below 3 on Language Use regardless of content quality.

In Reading, grammar knowledge helps you understand complex academic sentences — especially embedded relative clauses, passive constructions, and long noun phrases that are hallmarks of TOEFL reading passages.

Sentence Structure: All 4 Types with Examples

Using all four sentence types and varying them throughout your writing is one of the most reliable ways to raise your Language Use score. Each type is shown below with 5 TOEFL-level examples.

1. Simple Sentences

One independent clause. One subject, one verb, one complete thought. Use for clarity, emphasis, or after a long complex sentence to break the flow.

2. Compound Sentences

Two or more independent clauses joined by a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so) or a semicolon. Use to show two ideas are equally important or directly related.

3. Complex Sentences

One independent clause plus one or more dependent (subordinate) clauses joined by a subordinating conjunction. This is the most common structure in academic writing — use it to show that one idea qualifies, causes, or depends on another.

4. Compound-Complex Sentences

Two or more independent clauses AND one or more dependent clauses. Use sparingly — one or two per essay is ideal. Overuse leads to run-on errors and confusion.

Common ETS Wrong-Answer Errors in Reading

ETS deliberately writes incorrect answer choices that contain specific grammar errors. Recognizing these patterns helps you eliminate wrong answers faster in the Reading section.

Dangling Modifiers

A modifier "dangles" when the word it should modify is absent from the sentence or is not logically adjacent to it. ETS uses dangling modifiers in incorrect paraphrase answer choices.

Faulty Parallelism

Items in a list or series must use the same grammatical form. ETS answer choices often break parallelism subtly.

Pronoun Reference Errors

A pronoun must have a single, clear, unambiguous referent. ETS exploits vague or ambiguous pronouns in wrong answer choices.

Academic Grammar Patterns

Passive Voice in Academic Writing

Academic writing uses passive voice to maintain an impersonal, objective tone, to foreground results rather than agents, and to vary sentence structure.

Nominalization: Converting Verbs to Nouns

Nominalization is the process of turning verbs (or adjectives) into nouns. It is a defining feature of academic English and makes prose denser, more formal, and more concise.

Hedging Language

Academic writing avoids absolute claims unless fully supported. Hedging — using language that indicates probability, possibility, or qualified certainty — is a hallmark of academic English and signals sophistication to TOEFL scorers.

Avoid absolute language: "always," "never," "all," "every," "completely," "definitely" — unless the claim is unambiguously proven in context.

Verb Tenses in Academic Writing

Three tenses are especially important for TOEFL Writing and for understanding TOEFL Reading passages. Each is shown below with 10 TOEFL-level examples.

Simple Present — for General Facts and Established Truths

Use the simple present for facts that are always true, for summarizing texts and lectures, for scientific laws, and for describing what authors argue or claim in academic sources.

Present Perfect — for Recent Research and Ongoing Relevance

Use the present perfect for actions that began in the past and continue to the present, for research that has recently been completed, and for events whose effects are still felt now.

Past Simple — for Completed Studies and Historical Events

Use the past simple for research or events that were completed at a specific point in the past, for historical examples, and for specific studies referenced in academic texts.

Key Tense Rules for TOEFL Writing

Relative Clauses: Defining vs Non-Defining

Relative clauses add information about a noun without starting a new sentence. They are one of the most important structures for demonstrating grammatical range on TOEFL.

Relative Pronoun Rules: who / which / that / whose / where / when

Defining (Restrictive) Relative Clauses — 10 Examples

A defining relative clause identifies exactly which person or thing is being discussed. It is essential to the meaning. No commas. Use who, which, that, whose, where, when.

Non-Defining (Non-Restrictive) Relative Clauses — 10 Examples

A non-defining relative clause adds extra, non-essential information. Remove it and the sentence remains complete. Always use commas. Never use that — only who or which.

Conditionals in Academic Writing

Conditional structures are essential for academic argument — they express cause-and-effect, hypothesis, and recommendation. TOEFL Writing Task 2 (Academic Discussion) heavily rewards conditional use.

8 Academic Conditional Patterns for TOEFL Writing

Writing Task Grammar: Formal vs Informal Language

TOEFL Writing requires formal academic register. Every choice — contractions, pronouns, vocabulary — signals your register to scorers.

Formal vs Informal: Key Contrasts

Avoiding Contractions

Contractions (don't, can't, it's, I've, etc.) are never appropriate in formal academic writing. Always write out the full form:

Pronoun Consistency

Choose one person and maintain it throughout your essay. Mixing first person ("I"), second person ("you"), and third person within the same essay is a register and coherence error.

50 Academic Example Sentences — TOEFL Reading Passage Style

These sentences demonstrate the grammar patterns most commonly found in TOEFL reading passages. Study them to internalize academic sentence structure.

Complex Sentence Structures (1–15)

1. Although early researchers dismissed the phenomenon as anomalous, subsequent studies confirmed its significance across multiple contexts.
2. The degree to which environmental factors influence cognitive development remains a subject of considerable debate among developmental psychologists.
3. Having failed to account for seasonal variation, the initial model produced results that were inconsistent with observed data.
4. It was not until the discovery of penicillin in 1928 that modern antibiotic therapy became a practical possibility.
5. The mechanisms by which social behavior influences individual decision-making are complex and not yet fully understood.
6. Provided that current emission targets are met, global average temperatures may be stabilized below the critical 2°C threshold.
7. The findings, though controversial at the time of their initial publication, have since been replicated by independent research teams across three continents.
8. There is growing evidence to suggest that linguistic diversity may offer cognitive advantages beyond those traditionally associated with bilingualism.
9. The extent to which artificial intelligence can replicate human creativity is a question that has generated intense philosophical debate.
10. Rather than viewing urbanization as uniformly negative, contemporary researchers tend to examine both its costs and its potential benefits.
11. The archaeological record, while incomplete, provides compelling evidence that the settlement was abandoned rapidly and without apparent planning.
12. It has been proposed that the observed increase in antibiotic resistance is attributable, at least in part, to the widespread agricultural use of these compounds.
13. The relationship between socioeconomic status and educational achievement is well documented, though the causal mechanisms remain contested.
14. What distinguishes this approach from its predecessors is its emphasis on systemic factors rather than individual behavior.
15. Despite widespread skepticism within the academic community, the theory eventually gained acceptance following a series of carefully designed experiments.

Passive Voice Constructions (16–25)

16. Samples were collected at six-month intervals over a period of four years.
17. The data were analyzed using a multivariate regression model to control for confounding variables.
18. It has been argued that current policy frameworks are insufficient to address the scale of the challenge.
19. The results were subsequently verified by an independent laboratory before publication was authorized.
20. Significant progress has been made in understanding the neurological basis of language acquisition.
21. The ancient manuscripts were discovered in a sealed chamber beneath the monastery in 1997.
22. It is widely believed that early intervention produces the most significant and lasting educational outcomes.
23. The policy was later revised following sustained criticism from both academic and community stakeholders.
24. Three competing explanations have been proposed, each of which has received support from different research groups.
25. The enzyme was shown to be active only under highly specific temperature and pH conditions.

Hedged and Nominalized Constructions (26–40)

26. The implementation of stricter regulations may prove challenging in regions with limited administrative capacity.
27. Evidence suggests that the development of critical thinking skills is facilitated by exposure to diverse viewpoints.
28. The introduction of invasive species appears to be one of the primary drivers of native biodiversity loss.
29. It could be argued that the rapid expansion of digital media has undermined traditional journalistic standards.
30. The acceleration of climate change tends to disproportionately affect populations with the fewest resources to adapt.
31. Investigation of the underlying mechanisms remains an active area of research, with several competing hypotheses currently under evaluation.
32. The identification of causal factors in complex social phenomena typically requires longitudinal study designs.
33. There appears to be a correlation between increased screen time in adolescents and reported decreases in face-to-face social interaction.
34. The achievement of long-term sustainability goals requires the coordination of policy across multiple sectors and jurisdictions.
35. Analysis of the available data suggests that the observed trend is unlikely to reverse in the near term.
36. The reduction in manufacturing costs associated with solar technology has contributed significantly to its widespread adoption.
37. Consideration of cultural context is essential for the accurate interpretation of behavioral data collected across different populations.
38. The emergence of antibiotic-resistant bacteria poses one of the most pressing challenges in contemporary public health.
39. Collaboration between disciplines appears to be increasingly necessary as scientific questions become more complex.
40. The assumption that economic growth is uniformly beneficial has been challenged by researchers examining its distributional effects.

Comparative and Contrastive Structures (41–50)

41. While urban economies tend to generate higher average incomes, the inequality within cities frequently exceeds that observed in rural areas.
42. Unlike earlier models, the revised framework accounts for the influence of non-economic variables on consumer behavior.
43. The second approach proved considerably more effective than the first, reducing processing time by approximately 40%.
44. Whereas traditional conservation strategies focused exclusively on protected areas, contemporary approaches emphasize landscape-level connectivity.
45. In contrast to the findings of previous studies, the current research suggests a negative correlation between the two variables.
46. The benefits of early intervention far outweigh the costs when evaluated over a 20-year time horizon.
47. Just as individual behavior is shaped by social norms, so too are institutional policies influenced by the broader cultural context.
48. The new compound proved both more stable and less toxic than any of the alternatives previously tested.
49. Although the short-term economic costs of transitioning to renewable energy are significant, the long-term benefits are expected to be substantially greater.
50. The results of this study are broadly consistent with those of earlier investigations, though several minor discrepancies remain unexplained.

20 Error-Correction Exercises

Each sentence below contains one grammar error. Identify the error, then read the corrected version and the rule explanation. These reflect common TOEFL Writing errors.

Quick Grammar Reference Sheet