Not started
Avoiding repetition with the red one and the small ones.
Why you specifically
The rule
One and ones are used to avoid repeating countable nouns. Use one for singular nouns and ones for plural nouns, usually after an adjective or after words like this, that, these, those, or which. Do not use one/ones for uncountable nouns; in that case, English usually repeats the noun or uses another phrase.
The trap
I want the red, not the blue.
I want the red one, not the blue one.
Use one/ones to replace a countable noun after an adjective, so you do not repeat the noun.
These shoes are too small. Do you have bigger?
These shoes are too small. Do you have bigger ones?
Use ones to replace a plural countable noun after an adjective.
I bought a shirt and two white one.
I bought a shirt and two white ones.
Ones can replace plural countable nouns, but one cannot replace a plural noun.
The new model is cheaper than the old.
The new model is cheaper than the old one.
Use one to replace a singular countable noun; do not leave the noun out completely.
Prove it
10 drills
You have not fought this one yet.
