One and Ones 

"One" and "Ones" in the English Grammar

Similarity

As a personal pronoun, 'one' and 'ones' can be used to refer to 'people in general'.
They are both impersonal pronouns.

Difference

'One' replaces a singular noun

'Ones' replaces a plural noun

Tip!

We often use 'one' or 'ones' in more formal styles of writing. Too much use of it might result in a very formal language (that almost sound unnatural).

'One'

The pronoun 'one' replaces singular or one person, animal, or thing.

Example

The bus just left right now. The next one will be here in 15 minutes.

Here, the noun 'bus' is replaced by 'one'. The adjective 'next' can't be used alone and the repetition of 'bus' doesn't sound natural. Therefore, we replaced 'one' to avoid repetition.

Do you know these guys? Molly is the tall one and Emily is the short one.

As you can see, we cannot omit the pronoun 'one' and say 'Molly is the tall and Emily is the short'.

'Ones'

'Ones' replaces the nouns that are used in the plural form. They can refer to people, animals, or things.

Example

These pants are more to my style. The ones I tried before weren't to my liking.

Here, 'ones' replaces 'pants' (a plural noun)

My glasses are broken. I need new ones.

Uses

We use 'one' and 'ones':

after an adjective

Example

Which is your jacket, the brown one or the gray one?

after the definite article 'the'

Example

Do you see those dogs? Jessie is the one chewing that toy.

after 'which' as a question word

Example

Which one is your luggage?

Example

Look at all these muffins. That one looks delicious.

This One/That One/These Ones/Those Ones

'One' and 'ones' can be used as pronouns and accompany demonstrative determiners to refer to something(s)/someone(s).

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