Derivatives






Derivatives : Grammar and Spelling Tips




Words that are formed from existing words can also be confusing - sometimes the original spelling stays the same and sometimes it changes. Some to remember are:


• Words ending in
-our:


Examples : honour, favour, labour, humour.


Keep the
u when you add -able or -er.


Examples : honourable, favourable, labourer; favourite


But
u is very often lost before -ous.


Examples : humorous, glamorous, rigorous, honorary and honorific


• Occur and occurrence but refer and reference.


In verbs ending in
-ur, double the r when you add -ence.


Leave it single if the verb ends in
-er or -ear.


Examples : appear and apparent


• Drop the
o if you add -iation to a verb ending in -ounce.


Examples : pronunciation from pronounce.





























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