Derivatives
Derivatives : Grammar and Spelling TipsWords 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. Tips Index
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