descriptor + oneUse this after a singular countable noun from earlier context: a cheap bag ... the cheap one.
One and Ones
B2Use one and ones to avoid repeating a countable noun you already mentioned. One replaces singular nouns; ones replaces plural nouns.
What you'll learn
- Replace a singular countable noun with one.
- Replace a plural countable noun with ones.
- Add one or ones after adjectives and other describing words.
- Avoid one and ones with uncountable nouns.
- Choose singular or plural from the earlier noun.
Structure
descriptor + onesUse this after a plural countable noun from earlier context: cheap bags ... the cheap ones.
Build a sentence
Earlier noun
Choice
theredone
I like the red one.
Singular countable noun before: use one.
When to use
Choosing between items
Use one or ones when you compare similar things: the cheaper one, the blue ones, the second one.
Avoiding repetition
After you mention a noun once, use one or ones so the sentence sounds natural and lighter.
Comparing groups
Use ones when you talk about several items from the same type: the newer ones, the large ones, the ones on the shelf.
Markers
the red onethe small onesa better onethe second onethe ones on the left
Common mistakes
Wrong
I need a charger. Do you have a charger?
Correct
I need a charger. Do you have one?
One replaces the singular countable noun charger and avoids repetition.
Wrong
These cookies are stale. Let's buy fresh one.
Correct
These cookies are stale. Let's buy fresh ones.
The earlier noun is plural, so the replacement must also be plural: ones.
Wrong
I'll take the larger, not the smaller.
Correct
I'll take the larger one, not the smaller one.
After a describing word with the noun omitted, English needs one for a singular countable noun.
Wrong
This advice is more helpful than that one.
Correct
This advice is more helpful than that advice.
Advice is uncountable, so one cannot replace it.
Wrong
I want the brown boots, not the black one.
Correct
I want the brown boots, not the black ones.
Boots is plural, so the substitute must be ones, not one.
Common misconceptions
❝ If the adjective is clear, I can leave out one or ones every time. ❞
After a describing word, English often needs one or ones when the noun is omitted: the blue one, the cheaper ones.
❝ One and ones can replace any noun if the meaning is clear. ❞
They replace countable nouns only. They do not replace uncountable nouns like advice, furniture, or information.
Skills in this rule (5)
USE_ONE_AFTER_SINGULAR_NOUNw5Use one to replace a singular countable noun
When a singular countable noun is already clear, use one so you do not repeat the same noun again. Keep the meaning specific from the earlier context.
USE_ONES_AFTER_PLURAL_NOUNw5Use ones to replace a plural countable noun
When the earlier noun is plural, use ones instead of repeating it. This is common after adjectives, numbers, and other describing words.
USE_AFTER_ADJECTIVE_OR_DESCRIPTORw5Add one or ones after a describing word
After words like red, cheap, bigger, or the second, add one or ones if the noun is not repeated. Choose singular or plural from the original noun.
DONT_USE_WITH_UNCOUNTABLESw4Do not use one or ones for uncountable nouns
One and ones replace countable nouns only. With uncountable nouns, repeat the noun or choose another wording from the context.
PICK_NUMBER_FROM_CONTEXTw4Choose one or ones from the earlier noun
Look back at the noun you are replacing. If it is singular, use one; if it is plural, use ones.