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Double letters

After a short vowel, many consonants are written twice: ff, ll, ss and zz at the end of short words, ck for the /k/ sound, and doubles inside longer words like rabbit and little. Knowing when a letter doubles, and when it doesn't, is one of the first spelling rules children meet.

Example words

The rules in this pattern

"ck" written as "k"

At the end of a word, straight after a short vowel, the /k/ sound is spelled "ck": "back", "clock", "stick", "duck".

A double "r" in "-ference"

When the stress moves off "-fer" the "r" stays single: "reference", "preference", "transference".

One "r" where "-fer" doubles it

When the stress stays on "-fer" the "r" doubles: "referring", "referred", "preferred", "transferring".

One "l" where the stress doubles it

If the last part of the word is stressed, its last letter doubles before "-ing" or "-ed": control, "controlled"; patrol, "patrolling"; excel, "excelled".

One "n" in "beginning"

The stress is on "-gin", so the "n" doubles before "-ing" and "-er": "beginning", "beginner".

One "r" where the stress doubles it

If the last part of the word is stressed, its last letter doubles before "-ing" or "-ed": occur, "occurred"; deter, "deterred".

One "t" where the stress doubles it

If the last part of the word is stressed, its last letter doubles before "-ing", "-ed" or "-er": forget, "forgetting"; admit, "admitted".

A double "n" where the stress does not double it

If the last part of the word is not stressed, its last letter stays single: garden, "gardening"; open, "opened"; happen, "happened".

A double "r" where the stress does not double it

If the last part of the word is not stressed, its last letter stays single: offer, "offered"; enter, "entering"; wonder, "wondered".

A double "t" where the stress does not double it

If the last part of the word is not stressed, its last letter stays single: limit, "limited"; visit, "visiting"; benefit, "benefited".

When it's taught

From the National Curriculum for England (English Appendix 1):

Y1The /f/, /l/, /s/, /z/ and /k/ sounds spelt ff, ll, ss, zz and ck

Examples: off, hill, miss, buzz, back

Y3 / 4Adding suffixes beginning with vowel letters to words of more than one syllable

Examples: forgetting, beginning, gardening, limited, forgotten

Y5 / 6Adding suffixes beginning with vowel letters to words ending in -fer

Examples: referring, referred, reference, preferred, preference

Practise this pattern

Dictation sentences

Read each one aloud and ask your child to write it down.

  1. The duck fell off the hill.
  2. Miss Smith rang the bell.
  3. My little rabbit likes carrots.

Quick check

Can they spell these without help?

  • stuff
  • spell
  • grass
  • neck

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Teaching this pattern

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More patterns: Suffixes and word endings · Prefixes · The unstressed vowel (schwa) · Silent letters · Same sound, different spelling · Vowel digraphs · Soft c, soft g, dge and tch · Doubling before an ending · Long vowel sounds · Plurals · Apostrophes · Homophones · Word families · Root words and word origins · Spelling words as they sound · Words from other languages · Exception words · Look-alike letters