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SuffixesSuffixes stand after the root word. Adding a suffix changes the spelling and the meaning of a word. Pupils need to know how suffixes work and the spelling rules involved; this knowledge will also help to deepen their understanding of grammar, and in particular of how morphology relates to syntax and meaning.

Click here for a list of suffixes in commonly mis-spelt words.

There are two kinds of suffix:

  • derivational suffixes
  • inflectional suffixes
Derivational suffixes

These suffixes give related words different meanings and/or show that they belong to different word classes.

In this example,

prince - princess

the suffix -ess relates princess to prince, with a change of meaning indicating gender.

In this example,

derive - derivation - derivational

the suffixes ation (noun) and al(adjective) show that the words derivation and derivational are related to the verb derive, but are members of different word classes.

These derivational relations are the basis for the word families that pupils started to explore in the Literacy Strategy at KS2.

The following are some of the most common derivational suffixes, all of which feature in the KS3 spelling lists. They are given here with their grammatical functions in order to stress their importance in grammar as well as in spelling; notice how most of them give a relatively unambiguous clue to the word class of the word containing them.

  • ism forms nouns from other nouns (e.g. race/racism, organ/organism);
  • ist forms nouns or adjectives from nouns (e.g. tour/tourist, Buddha/Buddhist);
  • ful forms nouns or adjectives from nouns (e.g. spoon/spoonful, skill/skilful);
  • ation forms nouns from verbs (e.g. emigrate/emigration, civilise/civilisation);
  • ity forms nouns from adjectives (e.g. moral/morality, able/ability, rapid/rapidity);
  • ly forms adverbs from adjectives, (e.g. actual/actually, sincere/sincerely);
  • ise forms verbs from adjectives or nouns (e.g. normal/normalise, synchrony/synchronise).

This list is by no means complete, and many of those not shown here are important for spelling.

Derivational suffixes can combine with one another, which gives great flexibility in creating new words but also leads to further spelling complications. For example, -ity can be added to -able, but the result is-ability (e.g. suitability); and when adverbs are formed by adding -ly to an adjective ending in -ic, the result is usually -ically (e.g. frantically). Notice that the first of these complications can be guessed from the pronunciation, but the second cannot.

Inflectional suffixesThese relate different forms of the same word.

In this example,

book - books,

The suffix s relates the plural books to the singular form of the same word.

There are very few inflectional suffixes but they are extremely frequent and important so it is essential for pupils to have a good understanding of their spelling as well as of their grammatical function.

The following are the regular inflectional suffixes, all of which feature in the KS3 spelling lists. They are given here with their grammatical functions in order to stress their importance in grammar as well as in spelling; notice how most of them give a relatively unambiguous clue to the word class of the word containing them.

  • s marks a noun as plural, but a present tense verb as (third person) singular: e.g. The books look interesting but The book looks interesting; s changes to es after a hissing sound (e.g. hiss - hisses)
  • ed marks a verb as either a past tense or a past participle: e.g. She walked or She has walked.
  • ing marks a verb as a present participle: e.g. She was walking.
  • er marks an adjective or adverb as comparative: e.g. quicker, sooner.
  • est marks an adjective or adverb as superlative: e.g. quickest, soonest.

This list is complete as far as regular inflections are concerned. Irregular inflections either lack the suffix entirely (e.g. took) or have an exceptional suffix whose spelling must be learned (e.g. kept).

Exceptions:

explain - explanation

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Q: How does suffix change the spelling of a root word?
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