Suffixes Worksheet: -ful, -less and -ly (Free KS2)

What a suffix does and why -ful and -less make opposites

A suffix is a group of letters added to the end of a root word to change its meaning or its word class. The suffix -ful usually means 'full of' (a careful person is full of care; a helpful friend is full of help), while -less means 'without' (a careless person acts without care; a helpless kitten is without help). Because they pull in opposite directions, -ful and -less frequently create antonyms from the very same root: hope becomes hopeful or hopeless, use becomes useful or useless, fear becomes fearful or fearless. Pointing this pattern out helps children remember both suffixes at once and quietly builds their understanding of opposites.

How -ly forms adverbs and -ness forms nouns

The suffix -ly most often turns an adjective into an adverb, which is a word that describes how something is done: quick becomes quickly, careful becomes carefully, sad becomes sadly. Encourage children to ask 'How did they do it?' to check that an -ly word is working as an adverb. The suffix -ness turns an adjective into an abstract noun, a naming word for a quality you cannot touch: kind becomes kindness, dark becomes darkness, happy becomes happiness. Talking about word class (adjective, adverb, noun) as the words change gives children the vocabulary they will need throughout KS2 grammar lessons.

Spelling rules to watch when adding these suffixes

Most of the time these suffixes are simply added to the root with no change: care + ful = careful, care + less = careless, slow + ly = slowly. There are a few reliable adjustments worth modelling. When a root of more than one syllable ends in a consonant followed by y, the y changes to i before -ful, -ness and -ly: beauty becomes beautiful, happy becomes happiness and happily. One-syllable words keep their y, as in shyness. When -ly is added to a word ending in -le, the -le is replaced by -ly: gentle becomes gently, simple becomes simply. Note too that -ful as a suffix has only one l, even though the word 'full' has two; this is a very common spelling slip for this age group.

How to use this worksheet at home or in class

Read the worksheet through together first and say each new word aloud so children hear the extra syllable the suffix adds. For the writing task, let them build the words by saying 'root word plus suffix' before they write, which slows them down and reduces errors. There is no word bank, so the spelling has to come from the rules. The tick task has three correct sentences and three with a typical slip (carefull, happyly, kindless); ask your child to explain what is wrong and correct it, which turns proofreading into reasoning. Finish with the colouring, which gives a calm, low-pressure end to the activity and a chance to revisit the careful/careless/carefully word family one more time. The sheet works well as morning revision, homework, or a quick assessment of which suffix rules need more practice.

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