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One, ones
‘One’ is used instead of countable singular noun, “ones” is used instead of countable plural noun.
- “Do you need a pen ?” “No, thanks. I already have one.”
- I prefer light colours to dark ones.
- The shopkeeper showed me two T-shirts and I bought the one with some flower patterns on.
- The students in class B have got much better scores than the ones in C.
- The small buildings over there belong to the staff but those large ones are where the administrators stay.
If it needs to be indicated nouns that ‘one’ or‘ones’ pronouns substituting to noun refer to or to be remarked these(for example, with a “relative clause”), ‘the’ is used in front of them.
- “I would like to try that shirt on.” “Which one?” “The blue one.”
- “Those students in the back row are from the States, but the ones in the front line are from Canada.”
One/ones” isn’t used after “a/an, my/your … etc., some, any, both” and numbers. But ‘one’, ‘ones’ may be used if there is a adjective between them.
- Don’t make a sudden decision to work in that company; you deserve a better one with your qualifications.
- The bowl was so small for the salad she made that she had to use two large ones to serve it.
“One/ones” may be used after “the, this, that, these, those, each, another, which” or superlative adjective; however,it is not obligatory.
- Don’t insist on answering all the questions in this book; those ones in the worksheet will be enough for revision.
- The band that performed the last in the contest was also the best (one).
- Which (one) would you like to buy out of these two dresses? I will buy the black one if you buy the other (one).
- Please, don’t wear this pink tie; get another (one).
These pronouns are used extensively with the usage ‘relative clause’ as well.
- The one who is standing over there is our landlady.
- Dolores has filed the ones which belong to past year’s clients.
That of / Those of
These two usages can be used in order to not repeat again a noun which was mentioned in the sentence before. “That of” is used instead of a singular noun, “those of” is used instead of a plural noun.
- I can’t imagine a greater life than that of a teacher. (… than the life of a teacher)
- We should admit that the responsibilities of mothers are far more serious than those of fathers. (the responsibilities of fathers)
One of
A plural noun is used after the usage “one of”. Using a determiner as “the, my, those” in front of this plural noun is obligatory. It is necessary to pay attention to the subject-verb harmony after the usage ‘one of’. The verb after this usage must be singular.
- one of his books
- one of the/my/those birds (NOT one of birds)
- One of the cars in the parking lot has been sold.
- One of my classmates was awarded a scholarship in Canada.
- İstanbul is known as one of the most beautiful places not only in Europe but also in the whole world.
“One of” is sometimes used with a singular noun. But this singular noun is a noun making a reference to a group.
- Why don’t you ask one of the crew?
One or it
“One” is used to mention generally an object, “it” is used to make a reference to a certain object described before.
- I have to get a ticket to travel on public buses but I don’t know where I can get one. .)
- Take this card and don’t lose it; or else, you won’t be allowed to enter there.
- I haven’t got a calculator and I need one for the calculus class.
BUT
- “Have you seen my calculator around here?” “Yes, I’ve just seen it on your desk.”
