
12/10/09, 11:59 PM
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Join Date: Nov 2002
Location: Australia
Posts: 3,187
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It is easy, really. Just think of what an apostrophe is there for. It has only 2 purposes.
(a) it indicates a possessive (eg. Mary's hat, a team's success, children's toys, five days' work)
or
(b) it indicates something missing (an abbreviation): eg. who's that? (who is that); who's at the door? (who is at the door); the person who's at the door (the person who is at the door); I can't (I can not); don't! (do not!); wouldn't it be nice? (would it not be nice?); that's nice (that is nice).
In the case of 'who', there's a special word to indicate the possessive - whose. As in 'whose hat is that?'; the person whose cat had kittens. 'Whose' does not always apply to people. eg. 'the company whose business is to....'. We can say or write 'the company which does....', but we can't say or write 'the company which's business is....' - so we use 'whose' instead.
Over time, some apostrophes have gone missing, so we get words like 'good-bye', originally 'god be with ye'.
NOTE: an apostrophe should NEVER be used to indicate a plural. Not even when writing "in the 1980s". We can however say, or write "The 1980's version of...." - this shows possession, in a grammatical sense.
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