There is also other question that have confused for so long. I don't know when should we use ones and when should we use one,When we are using them as an adjective. Could anybody please answer my question? Many Thanks in ADvance
Top answer
One is never used in the plural as an adjective: I met her one day. Not: I met her ones days. CB
— Cool Breeze
One is never used in the plural as an adjective: I met her one day.
Not: I met her ones days.
CB
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In your sentence "one" is used as an impersonal pronoun. It refers to people in a very impersonal and general way. It means "a person". ("He" and "she" are personal pronouns.)
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"One" and "ones" can be used as pronouns to refer back to individual things that have already been mentioned.