Guide to spelling, punctuation and grammar

17
SPELLING
As we have already stated, it is important to
minimise the number of spelling errors. 
Some common spelling errors are particularly to be avoided:
THEIR/THERE/THEY’RE
Mixing up ‘their’ with ‘there’, or vice versa, is a particularly avoidable
error.
Remember that ‘their’ is the possessive adjective:
I went to their house.
It was their special celebration.
This is not to be confused with ‘there’, which is used to show that
something exists or is:
There exists just such a place.
There is no doubt about it.
Or it is used to mean ‘in that place’:
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The office is over there. 
There is the exact spot where it happened.
‘Their’ and ‘there’ are not to be confused with ‘they’re’ which is the
shortened version of ‘they are’:
They’re just appearing in the distance now.
They’re arguing because they misunderstand each other.