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1. One and ones

One is a pronoun used to replace a singular countable noun, so as to avoid unnecessary repetition.

- I've bought these two lipsticks.
- I like both but the purple one is gorgeous.

However, we will use ones to replace plural countable nouns.

- Whose are these socks?
- The big ones are mine.

2. How are one and ones used?

These particles are used according to specific structures:

WHICH ONE
Which one do you want? (apple)
WHICH ONES
Which ones do you want? (apples)
THIS / THAT ONE
This one is blue and that one is red. (teddy bear)
THESE / THOSE ONES
These ones are blue and those ones are red. (teddy bears)
THE ONE
The one on the left is more expensive. (dress)
THE ONES
The ones on the right are more expensive. (shoes)
THE + ADJECTIVE + ONE
The big one is a Dane and the small one is a Puli. (dog)
THE + ADJECTIVE + ONES
Which gloves do you like best, the white ones or the red ones?
A/AN + ADJECTIVE + ONE
His car is very old. He needs a new one.
SOME + ADJECTIVE + ONES
If you want tomatoes, I have some very good ones.

¡Recuerda!

The pronoun one is used to replace a singular countable noun. However, we use the pronoun ones when we replace plural countable nouns.
Singular Plural
Which one? Which ones?
This / that one These / those ones
The one The ones
The + adjective + one The + adjective + ones
A/an + adjective + one Some + adjective + ones

 

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