Level: beginner

We use one (singular) and ones (plural):

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.

after which in questions:

You can borrow a book. Which one do you want?
Which ones are yours?

one and ones 1


one and ones 2




this exercise very good and it given me  alot of benefit .


This is good exercise, thank you so much


really helpful , tank you

the 6th question.. why isn't there an article before one?

Hi pseudo_gal,
'The' doesn't appear before 'one' in sentence six because it isn't referring to a specific holiday. Any holiday could be 'one to remember.' Therefore, we omit the article.
The LearnEnglish Team 

really good test and help me to improve my language 

its really very helpful.

thanks f this cours