a/an and one (adjective)
Rule 1: When counting or measuring time, distance, weight etc. we can use either a/an or one for the singular:
$1=a/one pound $10000 = a/one million pounds
But not that in the rent is $ 100 a week the a before week is not replaceable by one.
In other types of statement a/an and one are not normally.
Interchangeable, because one+ noun normally means ‘one only/not more than one’ and a/an does not mean this:
- A shotgun is no good.
- One shotgun is no good.
Rule 2: Special uses of one:
(a) One (adjective/pronoun) used with another/others:
One (boy) wanted to read, another/ others wanted to watch TV.
One day he wanted his lunch early, another day he wanted it late.
(b) One can be used before day/week/month/year/summer/winter etc. or before the name of the day or month to denote a particular time when something happened:
One night there was a terrible storm.
One winter the snow fell early.
One day a telegram arrived.
(c) One day can also be used to mean ‘at some future date’ :
One day you’ll be sorry you treated him so badly.
a/an and one (pronoun)
One is the pronoun equivalent of a/an:
Did you get a ticket? –Yes, I managed to get one.
The plural of one used in this way is some:
Did you get tickets? – Yes, I managed to get some.
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