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The 'shun' sound can be spelt in three different ways which one you use depends on the last letter or letters of the root word.

• If the root word ends with 'c' or 'cs' use the -cian suffix: magic - magician
• When the root word ends with 'd' or 'se' the suffix used is usually -sion: expand - expansion
• If the root word ends with 't' or 'te' use -tion: invent - invention

Can you think of any other words which end in 'cian', 'sion' or 'tion'?