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Common Errors of Written Expression and Ways of Avoiding Them*
Jennifer Clarke


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7. The dreaded apostrophe

What's it for?

The apostrophe has two main uses:

(i) to indicate where letters have been omitted in the contraction of a word,

e.g. `they're' for `they are'

`you're' for `you are'
`can't' for `cannot'

(ii) to indicate that the noun (naming word) to which the apostrophe is attached possesses the thing which follows:

e.g. Fred's dog.

      the girls' playground.

Can I leave it out?

NO! As noted above, however, pronouns become possessive without an apostrophe. `He' becomes `his', `she' becomes `her', `they' becomes `their' and `it' becomes `its'.

Where do I put it? Singulars and plurals

The normal rule about possessive apostrophes is simple. Where the noun is singular (`Fred'), the apostrophe goes before the `s'. When the noun is plural (the girls), the apostrophe goes after the `s'.

If the playground belongs to or is used by only one girl, you write `the girl's playground'. But if the playground belongs to or is used by many girls, you write `the girls' playground'.

e.g. Your room looks like a dog's breakfast.

      The lost dogs' home.
      The footballer's groin injury.

      The footballers' cheer squad.

      The football team's cheer squad.

      The football teams' cheer squads.

Where you use more than one possessive noun in a row, you may drop all but the last apostrophe:

e.g. The parents and teachers' association.

      Builders Labourers' Federation.

What about plural nouns which do not end in `s'?

In words which become plural without adding `s', you put the apostrophe before adding an `s':

e.g. `Women's toilets.'

If you wrote `woman's toilets', as many students do, you would be suggesting that the toilets were used by only one woman.

e.g. `Constitutional cases are among the media's obsessions.'

      `We commenced the data's interpretation.'

What about names which end in `s'?

You have a choice here. You may simply add an apostrophe after the `s', or add an apostrophe and another `s'. Either of:

      `Peter Hanks' textbook'

      or

      `Peter Hanks's textbook'

is correct, but `Peter Hank's textbook' is not correct, as the author's name is Hanks

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