Avoiding Repetition with One and Ones
In English, we often use the pronouns one and ones to replace countable nouns so we don't have to repeat the same word. For example, instead of saying, "I don't like the red shirt; I want the blue shirt," you can say, "I want the blue one." If the noun is plural, use ones, such as asking for "the fresh ones" instead of "the fresh cookies."
This challenge tests your ability to correctly substitute singular and plural nouns in both everyday and imaginative scenarios. You will help wizards buy shiny new wands, assist customers ordering donuts and cupcakes at a bakery, choose the right clothes to pack for a vacation, and even pick out playful kittens at an animal shelter. Along the way, you will practice avoiding common mistakes, such as using "it" or "them" when a specific substitute is required.
You'll work through 10 questions featuring a mix of single-choice, multi-choice, drop-down, and drag-and-drop formats.
Try the quiz to check your knowledge!
Correct Answers
The correct answers are: I'll take the chocolate cupcake, and also that strawberry one. These vanilla cupcakes look good, but I prefer the chocolate ones.
We use one to replace a singular countable noun (like cupcake) to avoid repeating it.
We use ones to replace a plural countable noun (like cupcakes).
"A stale ones" is incorrect because "a" is singular but "ones" is plural. "Three big one" is incorrect because "three" is plural but "one" is singular.
"We have many donuts missing," the baker cried. "Which ones did the thief take?" "He took a large chocolate one with rainbow sprinkles," the detective replied, wiping a suspicious crumb from his chin.
We use ones after question words like which to replace a plural noun (donuts).
We use one after an adjective (chocolate) to replace a singular noun (a single donut).
Complete the baker's apology to his hungry customers.
"Don't eat the cookies on the left tray because they are totally burnt! Please take the fresh ___ on the right instead."
The correct answer is ones.
We use the plural pronoun ones to avoid repeating a plural countable noun ("cookies"). Because there is an adjective ("fresh") right before the blank, "ones" is the perfect fit. "The fresh them" and "the fresh those" are grammatically incorrect.
Complete the friends' packing conversation by choosing the correct words to avoid repeating the nouns. Drag the options to the correct blanks.
"Which jacket are you bringing? I think you should take the heavy one."
"Don't pack those stiff shoes. Bring the comfortable ones."
"Which jacket are you bringing? I think you should take the heavy one."
"Jacket" is a singular noun, so we substitute it with the singular pronoun "one".
"Don't pack those stiff shoes. Bring the comfortable ones."
"Shoes" is a plural noun, so we substitute it with the plural pronoun "ones".
Help the picky shopper decide what to say to the cashier.
"This yellow wool sweater is much too itchy. I think I will buy the green ___ instead."
The correct answer is one.
We use one to substitute for the singular noun "sweater" to avoid sounding repetitive. When describing a specific item with an adjective ("the green..."), "one" is required. "The green it" is not grammatically correct.
Help the hungry customer order some treats without repeating themselves! Drag the correct words to complete the sentences.
"I'd like a muffin, please. I think I'll take the blueberry one."
"Also, those cupcakes look amazing. I'll buy the chocolate ones."
"I'd like a muffin, please. I think I'll take the blueberry one."
We use "one" to replace a singular countable noun (muffin) so we don't have to say "the blueberry muffin."
"Also, those cupcakes look amazing. I'll buy the chocolate ones."
We use "ones" to replace a plural countable noun (cupcakes) so we don't have to say "the chocolate cupcakes."
The correct answers are: My suitcase is broken, so I need to buy a new one. Don't pack the dirty shirts; only pack the clean ones.
One correctly replaces the singular noun suitcase, and ones correctly replaces the plural noun shirts.
You cannot use "one" to replace an uncountable noun like water.
"The lighter ones" is incorrect for replacing the singular noun jacket (it should be "the lighter one").
"I don't like these wooden wands," the wizard complained. "Do you have any shiny ones?" "Certainly! And what about a hat? This tall one is very popular," replied the shopkeeper.
Use ones to avoid repeating the plural countable noun wands.
Use one to avoid repeating the singular countable noun hat.
The correct answers are: Look at all these kittens! I really love the playful ones. That orange cat is cute, but this grey one is friendlier.
Use ones for plural nouns (kittens -> playful ones) and one for singular nouns (cat -> grey one).
"A fluffy ones" is incorrect because "a" means one, but "ones" is plural.
"The little one are awake" is incorrect because "one" is singular and cannot be used with the plural verb "are" (it should be "the little ones are awake").
Help the clumsy wizard choose the correct word to finish his sentence.
"My old magic wand is completely broken," sighed the wizard. "I definitely need a new ___ before the big spelling bee tomorrow!"
The correct answer is one.
We use the singular pronoun one to avoid repeating a singular countable noun ("wand"). We cannot say "a new it" or "a new some."
Adjective
If you've ever written a French nice old wooden table and felt something was wrong without knowing why, you've hit the adjective-order rule. English insists on a particular sequence — opinion, size, age, shape, colour, origin, material — and rearranging the words makes a sentence sound non-native even when every individual choice is correct.
An adjective describes a noun or pronoun: a tall building, the soup is hot. Most adjectives also take comparative and superlative forms (taller, tallest), which is how you compare things — another core piece you need from day one.
Comparative and superlative
If you've ever doubled up — more better, the most cleverest — you've felt the most common comparative mistake. The fix is small but immediate: every adjective gets one comparative pattern, never both. Once you internalise which words use -er/-est and which use more/most, comparing things stops being a guess.
The comparative form compares two things (taller, more polite); the superlative picks the extreme of three or more (the tallest, the most polite). Short adjectives typically take -er/-est; longer ones use more/most. A small set are irregular: good → better → best, bad → worse → worst.
Countable and uncountable
If you've ever written informations, an advice, or furnitures — and only learned later that none of these exist in English — you've hit the countable/uncountable divide. The trap is that English's choice of which nouns count individually and which don't is partly arbitrary: information is uncountable; fact is countable; bread is uncountable; loaf is countable.
In English, nouns are either countable (chair, book) or uncountable (water, furniture, advice). Countable nouns take a/an, form plurals, and pair with many/few; uncountables don't pluralise and pair with much/little.
Determiner
If you speak a language without articles or demonstratives — Mandarin, Russian, Polish, Japanese, Korean — determiners are likely the most stubborn topic in your English. The rules feel small but the wrong choice (I went to home instead of I went home) immediately marks you as non-native. Mastering determiners is the highest-leverage move you can make for sounding natural.
A determiner comes before a noun to clarify which one, how many, or whose. Categories include articles (a/the), demonstratives (this/that), possessives (my/your), and quantifiers (some/many).
Noun
If you've ever frozen mid-sentence wondering whether to say an information or some information, child or children, they or them — you've hit the core of how English uses nouns. Nail this down and articles, plurals, possessives, and pronoun choice all stop feeling like guesswork.
A noun is a word that names something: a person, place, thing, idea, action, or quality. Nouns are the building blocks every other part of speech bolts onto. Spot one in a sentence and you can usually predict the article, the verb form, and the pronouns that follow.
Pronoun
If you've ever paused before who vs whom, its vs it's, or me vs I — you've felt how much weight pronouns carry in English. They're tiny words but they're case-sensitive (I vs me), context-dependent, and one of the few places where everyday English still trips careful speakers. Get the common patterns right and you instantly sound more careful.
A pronoun is a closed class of small words that replace nouns or noun phrases. Types: personal (I, you, he…), demonstrative (this, that), relative (who, which), interrogative (who?, what?), reflexive (myself), and indefinite (everyone, nobody).
Questions
If you've ever asked You like coffee? with rising intonation and gotten a confused look — you've felt the gap between casual and grammatical English questions. Many languages form questions with intonation alone, but English usually requires inversion (Are you ready?) or do-support (Do you like coffee?). Skip the structure and your questions sound like uncertain statements.
Questions in English use inversion of subject and an auxiliary (Can she dance?) or do-support when no auxiliary is present (Does the milk go in the fridge?). Yes/no questions, wh-questions, negative questions, and tag questions all share this machinery.
Subject
If you've ever written The list of items are wrong (should be is wrong) — you've hit the subject-agreement trap. The subject is list, not items, and the verb has to agree with it. Long sentences with prepositional phrases between the subject and verb are where this most often goes wrong, and getting it right is what stops careful readers from flagging your writing.
The subject is the part of a sentence or clause that says who or what the sentence is about. Typically a noun, pronoun, or noun phrase before the verb, controlling the verb's number and person.
A1 | Elementary | Beginners
If you can say your name, ask Where is the toilet?, and read a simple bus sign — but freeze when someone speaks at normal speed — you're at A1. That's not a problem to fix; it's the level where most learners actually live for a while, and recognising it lets you pick the right material instead of drowning in advanced grammar that wasn't meant for you yet.
A1 is the starting level of the CEFR framework, covering basic everyday communication: greetings, introductions, simple personal questions, present-tense forms of be/have/do, and core determiners and prepositions.
A2 | Elementary | Pre-intermediate
If you can order coffee, ask for directions, and tell someone what you did yesterday — but struggle the moment the conversation drifts into anything abstract — you're operating at A2. Knowing this matters: A2 is the level where most learners plateau because they reach for B2 material too early and burn out. Stay here and your foundations get unbreakable.
A2 is the elementary level in the CEFR framework, covering routine communication and the first wave of real grammar: past simple and continuous, present perfect, basic modal verbs, first conditional, and common verb-pattern rules.
Difficulty: Medium
If easy questions feel too obvious but hard questions leave you guessing, you're probably ready for Medium — the level where most real learning happens. It pushes just enough to expose the rules you don't quite have yet, without burying you in edge cases. This is where steady fluency is built, one well-aimed challenge at a time.
The Medium difficulty tag marks middle-range challenges — typically A2 to B1. One rule per question, realistic distractors, and contexts that require active thought rather than instant recognition.