English Usage Reference

A sentence needs a subject, a finite verb, and a complete thought. Words such as although, because, if, when, and while turn a clause into a dependent clause.

Test: If a sentence begins with a dependent marker, look for a main clause before you accept the sentence.

Two independent clauses need a period, a semicolon, or a comma plus a coordinating conjunction.

Test: If each side could stand alone, the boundary needs real punctuation.

When a dependent clause comes before the main clause, put a comma after it.

Test: Opening because/although/when/if clauses usually need a comma before the main clause.

Conjunctive adverbs such as however, therefore, moreover, and nevertheless do not behave like and or but. Use a semicolon or period before them when they connect two sentences.

Test: However and therefore usually need strong punctuation before them and a comma after them.

Use a comma after a substantial opening phrase or clause.

Test: If the sentence starts with time, cause, condition, contrast, or location context, check for a comma.

Separate items in a list. In formal American writing, use the Oxford comma before the final and or or.

Test: If a list has three or more items, each boundary should be visible.

Nonessential renamings, side comments, and interrupters take commas on both sides when they fall inside a sentence.

Test: If the sentence still identifies the person or thing without the phrase, use commas.

Use a semicolon before and a comma after however, therefore, moreover, nevertheless, consequently, and similarly when they connect two sentences.

Test: A comma before however is not enough if the words before it form a full sentence.

A colon can signal that the second part explains the first part.

Test: The words before the colon should be able to stand alone.

Dashes create stronger interruption than commas. In formal test writing, use them sparingly and keep pairs balanced.

Test: If an interruption starts with a dash inside a sentence, it usually needs a closing dash.

Parentheses hold information that is useful but secondary. If the parenthetical is inside a sentence, the main sentence punctuation usually stays outside.

Test: Remove the parenthetical. The surrounding sentence should still read smoothly.

For one owner, add apostrophe-s even when the noun ends in s, unless a style guide says otherwise.

Test: Ask: whose strategy? The team's.

For regular plural owners, add the apostrophe after the plural s.

Test: If the owner is already plural and ends in s, put the apostrophe after it.

Plural nouns that do not end in s take apostrophe-s.

Test: Children, people, men, and women are already plural without final s.

Its is possessive. It's is a contraction of it is or it has.

Test: Substitute it is. If the sentence breaks, use its.

Plural nouns normally end in s or es without an apostrophe.

Test: If you mean more than one and not ownership, leave the apostrophe out.

A speaker tag such as she said is attached to a quotation with a comma, not a period.

Test: If the tag identifies who spoke, the quotation and tag belong to one sentence.

American style places periods and commas inside closing quotation marks.

Test: Question marks and exclamation points depend on whether they belong to the quoted words.

A colon can introduce a full quoted sentence when the lead-in is complete.

Test: The lead-in before the colon should read as a complete sentence.

Short works such as articles, poems, short stories, and episodes usually take quotation marks; long works such as books and films are usually italicized.

Test: Short contained work: quotation marks. Larger standalone work: italics in polished typesetting.

An adverb ending in -ly clearly modifies the adjective after it, so a hyphen is usually unnecessary.

Test: If the first word ends in -ly, check whether the hyphen is doing any work.

A hyphen can distinguish a small-business owner from a small business owner.

Test: If the first adjective could modify the noun by itself, consider whether a hyphen changes the meaning.

Capitalize names of specific people, places, institutions, languages, and official titles used as names.

Test: English is a language name; university is not capitalized unless it is part of the official name.

In formal prose, spell out small numbers when style requires it, use numerals for measurements and exact data, and hyphenate compound numbers from twenty-one to ninety-nine.

Test: The rule is style-dependent; consistency matters more than one universal cutoff.

Use in for containers, areas, fields, months, years, seasons, and longer periods.

Test: If you mean inside an area or during a broad time period, in is the default.

Use at for a precise point, address-like location, event, or exact time.

Test: If you could point to it on a map, clock, or schedule, at often fits.

Use on for surfaces, lines, streets, platforms, days, and calendar dates.

Test: Surface or calendar day/date usually means on.

Use arrive in with cities, countries, and large areas; use arrive at with buildings, events, and specific destinations.

Test: Large area: in. Specific point: at.

On time means at the scheduled time. In time means before it is too late.

Test: If there is a deadline or danger, in time often expresses the idea.

Many academic and test phrases are idiomatic: interested in, good at, responsible for, capable of, similar to, different from, based on, dependent on.

Test: When a preposition feels arbitrary, treat the adjective or verb plus preposition as one vocabulary item.

Use between for two distinct people or things, and among for members of a group.

Test: Two named options: between. Diffuse group: among.

Subjects beginning with each, every, either, or neither are usually singular.

Test: Each points to one item at a time.

Modern English commonly uses singular they, but formal tests often avoid the issue by pluralizing the noun.

Test: Pluralizing often creates the cleanest formal sentence.

Use who for the subject of a verb and whom for the object of a verb or preposition.

Test: Try he/him. If he fits, use who; if him fits, use whom.

Only changes meaning depending on where it appears.

Test: Put only directly before the word or phrase it restricts.

Not only...but also, either...or, neither...nor, and both...and should connect grammatically matching elements.

Test: The words after each half of the pair should have the same structure.

A comparison must put equivalent things on both sides.

Test: Salary should be compared with salary, not with people.

Use fewer with things you can count individually and less with amounts or mass nouns.

Test: If you can put a number before the noun, fewer is usually right.

However signals contrast, therefore signals result, moreover signals addition, and for example signals illustration.

Test: Name the relation before choosing the transition.

Because already marks cause, and although already marks contrast. Avoid stacking them with redundant connectors.

Test: One connector is enough for one relationship.

Remove words that repeat meaning already present in the sentence.

Test: If one word contains the meaning of the other, delete one.

Formal English is often clearer when actions are verbs rather than abstract nouns.

Test: Look for make a decision, give an explanation, conduct an analysis; often the noun can become a verb.

Avoid this, that, and which when the reference is vague.

Test: If which could refer to a whole clause or several nouns, rewrite with a specific noun.

A sentence can be grammatically correct and still be wrong if it distracts from the paragraph's main purpose.

Test: Ask what the paragraph is trying to prove or explain; delete or move anything that serves a different purpose.

Useful details clarify, support, define, compare, or give evidence. Decorative details may sound vivid but fail the rhetorical goal.

Test: If the detail does not help the reader understand the claim, it probably does not belong.

When a question asks for a sentence that introduces, concludes, contrasts, or gives an example, choose the option that performs that exact job.

Test: Name the requested function before reading the choices.

In essay exams, address all parts of the prompt and maintain a clear position or controlling idea.

Test: Underline every instruction in the prompt; your response should visibly answer each one.

Examples should prove or clarify a claim. A list of examples without interpretation is underdeveloped.

Test: After every example, ask what it shows.

A paragraph should move through a recognizable sequence: general to specific, problem to solution, cause to effect, chronology, comparison, or claim to evidence.

Test: Look for time words, pronouns, repeated nouns, and cause/effect signals.

A strong topic sentence tells readers what the paragraph will do, not just what subject it will mention.

Test: A useful topic sentence should predict the paragraph's evidence.

Start a new paragraph when the passage shifts to a new stage, reason, example, counterargument, or consequence.

Test: If a sentence starts answering a different question, it may need a new paragraph.

An introduction should set up the topic and direction. It should not include every detail or a conclusion's final judgment.

Test: The opening should orient the reader and create a reason to keep reading.

A conclusion should follow from the argument and often return to the main idea with a broader implication.

Test: A conclusion should answer: so what follows from all this?

A pronoun should point to a noun that is obvious, nearby, and grammatically compatible.

Test: If two nouns could be they, name the noun instead.

Demonstratives are clearer when they point to a named idea rather than floating alone.

Test: If this or that refers to a whole previous sentence, add a summary noun.

Avoid monotonous repetition, but repeat important nouns when replacing them with pronouns would blur the chain of ideas.

Test: Clarity beats variety when the reference chain is complex.

Linking words must match the relationship: addition, contrast, cause, result, concession, example, sequence, or summary.

Test: Do not choose a connector because it sounds academic; choose it because it names the logic.

Too many discourse markers make writing mechanical. Use transitions where the relationship would otherwise be unclear.

Test: If sentence order already shows the relationship, a transition may be unnecessary.

A sophisticated word is wrong if it does not match the relationship among the ideas.

Test: Before choosing a word, decide whether the sentence needs support, contrast, cause, result, or concession.

Some words habitually combine with particular partners: make a decision, conduct research, raise a concern, pose a threat, reach a conclusion.

Test: Learn verb-noun pairs as units, not as interchangeable synonyms.

English often changes meaning and grammar through suffixes: analyze, analysis, analytical; rely, reliable, reliability.

Test: Check whether the sentence slot needs a noun, verb, adjective, or adverb.

A near-synonym may carry the wrong connotation, intensity, or register.

Test: Ask whether the word implies emotion, blame, certainty, scale, or formality that the sentence does not support.

Words such as thing, aspect, factor, issue, and area can be useful, but they often hide the actual idea.

Test: Replace vague nouns with the real subject whenever possible.

A passage should not suddenly shift from formal analysis to slang, hype, or personal chatter unless the purpose calls for it.

Test: Match the diction to the passage's audience and genre.

Hedging words such as may, suggests, likely, and appears can make claims more accurate.

Test: If the evidence is partial, avoid absolute claims.

Contractions, vague intensifiers, and casual idioms may sound out of place in academic or exam essays.

Test: Replace casual compression with precise formal wording.

Formal writing should be clear, not inflated. Long words and nominalizations can weaken style.

Test: If a shorter verb says the same thing, use it.

Avoid unnecessary shifts among I, you, one, we, and they.

Test: Pick the perspective that fits the passage and keep it stable.

Use tense to show when events occur relative to one another, not simply to vary the sentence.

Test: Map the timeline before choosing the verb form.

Have, has, and had show that one action is connected to a later point in time.

Test: By plus a past deadline often points to past perfect.

Active voice emphasizes the doer. Passive voice emphasizes the receiver, result, or process.

Test: Use passive voice intentionally, not by habit.

After verbs such as require, recommend, insist, and suggest, formal English often uses the base verb.

Test: Demand/recommend/insist/suggest that often takes a base-form verb.

Conditional sentences need matching time and reality signals.

Test: Past unreal condition: if + had done, would have done.

A singular count noun usually needs a determiner: a, an, the, this, that, my, each, or another.

Test: If the noun is singular and countable, check for a determiner.

Use the when the reader can identify which person, thing, group, or concept you mean.

Test: If you mean this known one, use the.

Plural count nouns and mass nouns often take no article when used generally.

Test: General category, plural or mass: often no article.

Use many, few, fewer, number with count nouns; use much, little, less, amount with mass nouns.

Test: Can you count it as one, two, three? If yes, use count quantifiers.

This and that are singular. These and those are plural. This/these are nearer; that/those are farther or previously mentioned.

Test: Match the determiner to the noun's number.

A useful claim is specific enough to prove and modest enough for the evidence available.

Test: If a claim needs a whole book to defend, narrow it.

Do not assume the reader will infer the connection between evidence and conclusion.

Test: Use a sentence to connect data to interpretation.

When describing charts or tables, report direction, size, comparison, and exceptions without inventing causes.

Test: Shows is safer than proves unless the evidence establishes causation.

Strong writing can concede limits without weakening the argument.

Test: Use some, many, often, can, may, or in some cases when the claim has exceptions.

Academic argument improves when it notices what must be true for a claim to hold.

Test: Ask what hidden condition the argument depends on.

A main idea summarizes the controlling point. A detail supports, illustrates, qualifies, or limits that point.

Test: If the statement is too small to organize the whole passage, it is probably a detail.

A valid inference is not a guess; it is a conclusion forced or strongly supported by the wording.

Test: Avoid choices that go beyond the text's evidence or emotional tone.

Words such as surprisingly, merely, valuable, flawed, and supposedly reveal stance. Structure also reveals whether the writer is explaining, criticizing, comparing, or persuading.

Test: Look for evaluative adjectives, concessions, and contrast markers.

IELTS-style answers may be marked wrong if they exceed the word limit or use the wrong form, even when the idea is correct.

Test: Check the required number of words, number format, and singular/plural form.

Context clues include contrast, examples, definitions, cause/effect, and parallel structure.

Test: Let the sentence relationship define the word before relying on memory.