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Years 5 and 6 English · Key Stage 2 · Spelling – English Appendix 1

Years 5 and 6 spelling: -cious, -tious, -cial and -tial

Some of the trickiest endings in English sound the same but are spelt in different ways. In Years 5 and 6 children learn that words ending in a “shus” sound are spelt -cious or -tious (vicious, ambitious), and words ending in a “shul” sound are spelt -cial or -tial (official, essential). They learn clues for choosing between them, and a short list of exceptions to remember.

Endings -cious, -tious, -cial and -tial, explained

Listen to the ends of vicious and ambitious, or of official and essential. In each pair the endings sound identical, a soft “shus” or “shul”, yet they are spelt differently. Phonics cannot help here, because the sound is made by the letters c or t followed by i, not by the letters s and h that a younger child would expect. This is why teachers move beyond sounding words out and teach children to look at the word’s family and its pattern.

For the “shus” ending, the first clue is the related word. If the root word ends in -ce, the sound is usually spelt with a c: vice becomes vicious, space becomes spacious, grace becomes gracious and malice becomes malicious. A common helpful pattern, though not a rule without exceptions, is that words with a related word ending -tion are spelt -tious: ambition becomes ambitious, caution becomes cautious, nutrition becomes nutritious and infection becomes infectious. Some words simply have to be learnt, such as delicious, precious and suspicious. Anxious is a famous exception, because its sound is spelt with xi.

For the “shul” ending, the clue is the letter just before it. The ending -cial is common after a vowel letter (a, e, i, o, u): official, special, social, artificial. The ending -tial is common after a consonant letter: partial, essential, confidential, substantial. Four exceptions are usually taught: initial, financial, commercial and provincial. Children often remember them best as a little group, and the last three are easier once you notice their relatives: finance, commerce and province all end in -ce, just like vice and vicious.

Schools usually teach this over several weeks and then come back to it, and the programme of study asks teachers to revise earlier spelling work alongside it. Typical activities include sorting words into columns, finding the root word, writing sentences, and a regular check of a handful of words chosen from the Year 5 and 6 spelling list. Spelling is also assessed in the national tests in May of Year 6, and in all of a child’s writing.

What helps most at home is attention to meaning and families of words, not repeated copying. A child who knows that ambitious comes from ambition, or that official is related to office, has something to hold on to when the sound offers no clue at all.

Words your child will hear

Suffix
A group of letters added to the end of a word, such as -ious or -ial.
Related word
A word from the same family that gives a spelling clue. Ambition is related to ambitious, and space to spacious.
Word family
Words that share a root and are related in meaning, such as office and official.
Vowel letter
One of the letters a, e, i, o and u.
Consonant letter
Any letter that is not a vowel letter, such as r, n or t.
Exception
A word that doesn’t follow the usual pattern and has to be learnt, such as financial.
Soft c
A c that sounds like s, as in the middle of vice and the start of cell.

What the National Curriculum says

In Years 5 and 6, pupils should be taught to:

  • Spell words with endings which sound like /ʃəs/ spelt –cious or –tious
  • Spell words with endings which sound like /ʃəl/

Objectives from the National Curriculum in England, © Crown copyright, used under the Open Government Licence v3.0.

Try it: finishing five words

Choose -cious, -tious, -cial or -tial to complete each word: vi___ (cruel or fierce), ambi___ (keen to succeed), offi___ (from an authority), par___ (not complete), essen___ (very necessary).

  1. Say each word and listen to the ending. The first two end in a “shus” sound, so they take -cious or -tious. The last three end in a “shul” sound, so they take -cial or -tial.
  2. Vicious: the related word is vice, which ends in -ce, so the sound is spelt with a c. That gives -cious.
  3. Ambitious: the related word is ambition, which ends in -tion. That is the clue for -tious.
  4. Official: look at the letter before the ending. The word begins offi-, so the letter before is i, a vowel letter, which suggests -cial. The related word office confirms it.
  5. Partial and essential: the letters before the ending are r and n, both consonant letters, which suggests -tial. Check the exception list (initial, financial, commercial, provincial) and neither word is on it.

vicious, ambitious, official, partial, essential

Common mistakes and how to help

Writing the ending as it sounds, such as “vishus” or “offishul”

Up to now, spelling by sound has usually worked. These endings are the point where it stops working, because the sh sound is spelt with c or t.

What helps: Tell your child that no word in this set uses sh for the sound. Replace it by thinking of the root word or the letter before the ending.

Using -cious or -cial every time because the c looks more familiar

Everyday words like delicious and special come up most often, so children write “ambicious” or “essencial”.

What helps: Look for the relatives. Ambition suggests -tious. A consonant letter just before the ending suggests -tial. Making a quick list of the family helps.

Treating the vowel and consonant clue as a rule that never breaks

The clue works for most words, so children confidently write “finantial” or “commertial”.

What helps: Learn the four exceptions as a group: initial, financial, commercial, provincial. Link the last three to finance, commerce and province, then say all four aloud together and use them in a silly sentence.

Leaving out the i: “vicous”, “cautous”, “ambitous”

The i is not clearly heard in the ending, so it is easy to leave out.

What helps: Say the word in a slow, exaggerated way: vi-ci-ous, cau-ti-ous. Put the letters in a different colour in a word list.

How to help at home

  • Find the family. Make pairs of cards with a root word on one and its relative on the other: space and spacious, ambition and ambitious, office and official. Match them up and talk about why the spelling follows.
  • Sort into four columns. Write -cious, -tious, -cial and -tial at the top of a page, then sort words such as delicious, cautious, special and essential into the right column. Keep adding words from reading.
  • Spot them in the kitchen. Food packaging uses these words a lot: delicious, nutritious, special. Ask your child to find three and explain which spelling clue applies.
  • Dictate a silly sentence. Read out a sentence such as “The official thought the special cake looked delicious” and have your child write it from hearing alone. Check it together and look closely at any slip.
  • Little and often. Choose three words a night and use look, cover, write, check. Revisit tricky ones a few days later, because spellings stay when they are revisited, not drilled once.

Related topics

Builds on

More on spelling – English Appendix 1

Everything in Years 5 and 6 English

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