We use one (singular) and ones (plural) to avoid unnecessary repetition.

See those two girls? Helen is the tall one and Jane is the short one.
Which is your car, the red one or the blue one?
My trousers are torn. I need some new ones.
See those two girls? Helen is the one on the left.
Let’s look at the photographs. The ones you took in Paris.

We often use them after Which ... in questions:

You can borrow a book. Which one do you want?
There are lots of books here. Which ones are yours?




Thanks for teachin us in an excellent way.

tanx alot really i get benifite

nice test i like


That's Nice .. Slightly Easy Test Must Be Difficult And Random

 British Council ROCKS!!!!!!!

so pround thank's

 thank you  for your help

British Council  English course is very  very  Greate. Any one  will improve  Sharpe English knowledge.very unvaluble services.