When choosing between coats, repeating coat can be unnecessary. The blue one keeps the colour and lets the listener recover the noun from context.
The idea
Use one for a singular countable noun and ones for a plural countable noun. Keep the words that identify it: another one, a bigger one, the ones on the floor.
Examples
- This pen doesn't work. Do you have another one?
- The grey coat is warmer than the blue one.
- These towels are clean; the ones on the floor are dirty.
- I need a smaller box, not a bigger one.
- Which gloves are yours? The woollen ones.
- We have enough cups, but we need some clean ones.
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Watch out
For uncountable water, use some, not one. Usually omit ones directly after a number or some: two; some. A describing word allows two red ones; some clean ones.
Try it yourself
Choose the correct option. The grey coat is warmer than the blue ___. (one / ones)
Show answer or example answer
one
one replaces the singular countable noun coat, keeping the blue as its description.
Choose the correct option. These cups are dirty. We need clean ___. (one / ones)
Show answer or example answer
ones
ones replaces plural cups. Clean describes the cups you need.
Choose the correct option. I need some water. Do you have ___? (some / one)
Show answer or example answer
some
some refers to uncountable water. One would need a countable item, such as one bottle.
Practice round
Answer questions and rebuild English sentences to practise. Your score is shown.
Choose the correct option. The grey coat is warmer than the blue ___. (one / ones)
Choose the correct option. These cups are dirty. We need clean ___. (one / ones)
Choose the correct option. I need some water. Do you have ___? (some / one)
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Compare two bags without repeating bag. Then choose some towels by colour and ask for water. Use one, ones and some where each fits.

