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Verbal Reasoning · Word

Identify an impossible word formation

Determine which candidate cannot be formed under a supplied letter rule.

Free to use and free to share. There is no sign-up, no score, and nothing a child does here is recorded or sent anywhere.

Practise it now

Four of these words can be spelt using the letters of DESPERATE. One cannot. Tap the word that cannot be made.

It covers most of this skill rather than all of it.

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A worked example

One question of the kind this skill is tested with, worked all the way through: the reasoning, and what the wrong answers are there to catch.

Counting letters instead of scanning for them

Each letter of EQUIPMENT may be used only as many times as it appears in it. Which of these words cannot be spelt from those letters?

Work one long word through and see why crossing letters off beats reading them.

  1. ITEM
  2. WORK
  3. UNIT
  4. MEET

Answer: WORK

How you get there

WORK needs the letter W, and there is no W anywhere in EQUIPMENT, so it can never be spelt from it. Every other word here uses only letters that are in EQUIPMENT: "UNIT" is the one worth checking slowly, and each of its letters is there. A missing letter is found by scanning, which is why this kind is worth doing first: run down the option, and the moment a letter is not in the long word you can stop.

Why the other answers tempt

A word can use every letter you can see in the long word and still fail, because it needs one of them twice and the long word has only one.

If they are stuck, say this

Write the long word out and cross a letter off each time you use it. A word fails as soon as you need a letter that has already been crossed off.

Now do it live in Built from DESPERATE

What this exercise is doing

Built from DESPERATE

Four of these words can be spelt using the letters of DESPERATE. One cannot. Tap the word that cannot be made.

Letters from a word are a supply, not a menu: DESPERATE hands you each of its letters once, and once a letter is spent it is gone. TEST fails on the T. DESPERATE has only one T, and TEST needs 2. That kind of failure cannot be found by scanning, because the letter IS there. It is found by counting, which is why these questions catch out children who only look. The reliable method is to cross letters off as you spend them, one word at a time, and to pay particular attention to any word that wants the same letter twice. A repeated letter is the commonest way a word runs out, and it is the one thing a quick glance never checks.

What to say if they get stuck

  1. Each letter of DESPERATE can only be used once. Cross a tile off as you use it and see whether you run out.
  2. Every letter of the impossible word IS in DESPERATE somewhere, so scanning will not find it. Count how many times each letter appears instead.
  3. Watch the repeated letters. DEER needs the same letter twice and still works, so a repeat is not proof on its own.

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Questions parents ask about identify an impossible word formation

Answered from what the skill map records about this skill, not from a template. Every answer here is on the page, and the same questions are the page's FAQ structured data.

Determine which candidate cannot be formed under a supplied letter rule. It is one of 26 named verbal reasoning skills in the 11+, in the word strand, and this page carries 1 interactive exercise that practises it.

Verbal reasoning is a set of question types, not a subject to revise

A free diagnostic works out which of the codes, analogies, word puzzles and logic types are already secure, and which are not.