B2 · Upper Intermediate TOEIC 605–780 IELTS 5.5–6.5 Word Formation (Morphology)

Conversion (Zero Derivation)

Words that change class without any suffix: to email → an email, to google, to water (plants).

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What is Conversion (Zero Derivation)?

Conversion, commonly known as zero derivation, is a dynamic word-formation process in English. It occurs when a word shifts its grammatical category (e.g., from a noun to a verb) without any physical alteration to its spelling or form. Because it looks and sounds identical, its function must be deduced strictly from its position within the sentence. It is one of the most productive ways English continuously invents new terminology.

Conversion Structure and Formula

When a word undergoes conversion, it slips into a completely new structural slot within a sentence, taking quickly taking on the rules of its new part of speech.

  • As a Noun (Subject / Object):
    • S + V + O
    • Example: I need some water (O).
  • As a Verb (V / V-s/es / V-ed/V3):
    • S + V + O
    • Example: I water (V) the plants every day.
  • As an Adjective Modifying a Noun (Adj):
    • S + V (linking) + Adj
    • Example: The trash can is empty (Adj).
  • Noun acting as an Adjective:
    • S + V + O
    • Example: It is a daily (Adj) newspaper.

How to Form Noun to Verb Conversion

Using an existing noun as an active verb is incredibly common, especially when describing actions associated with objects or modern technology.

  • A book (Noun - S/O) → To book (Verb - V: to reserve)
    • I read an amazing book.
    • Let's book a table.
  • A hand (Noun) → To hand (Verb: to pass something)
    • My hand hurts.
    • Please hand me the keys.
  • An email (Noun) → To email (Verb: to send)
    • Send the email.
    • I'll email you.
  • Google (Proper Noun) → To Google (Verb: to look up online)
    • He works at Google.
    • Just Google it!

How to Apply Verb to Noun Conversion

This flips the process: a verb describing an action becomes a noun referring to the act itself or the overarching concept.

  • To walk (Verb) → A walk (Noun)
    • We walk fast.
    • Let's go for a walk.
  • To call (Verb) → A call (Noun)
    • I will call him.
    • I missed your call.
  • To run (Verb) → A run (Noun)
    • They run quickly.
    • I went for a 5k run.

Adjective to Noun and Verb Conversions

Sometimes, adjectives morph into nouns or verbs in specific contexts:

Adjective to Noun Formatting

Oftentimes used to describe a broad categorization of people. Note the sentence formula shifts to treat the adjective as the Subject (S).
* The rich (S) should invest more. (Meaning: Rich people)
* We must assist the poor (O). (Meaning: Poor people)
* I bought a daily (O). (Meaning: A daily newspaper)

Adjective to Verb Formatting

Adjectives can also become verbs indicating the process of applying that adjective's quality.
* The room is clean (Adj). → I need to clean (V) the room.
* The bottle is empty (Adj). → Please empty (V) the bottle.

How to Tell the Difference Between Conversion and Derivation

  • Derivation involves physically adding a prefix or suffix to change the word's class (e.g., Happy → Happiness**). The word looks different.
  • Conversion (Zero Derivation) changes the grammatical class invisibly. The word's spelling remains exactly the same (e.g., a Google search → to Google something), and you only know the difference by how it acts in the sentence.

Summary & Cheatsheet for Conversion (Zero Derivation)

Conversion Type Description Examples
Noun → Verb Object name used as an action term. To book, to water, to email
Verb → Noun Action term used as a concept/event. A walk, a call, a hope
Adjective → Noun Describing word used as categorical group. The rich, the poor, a daily
Adjective → Verb Describing word used as action of making. To empty, to clean, to dry

💡 Tip: Don't be afraid to verbify nouns! English is incredibly flexible. In many modern professional environments, using a noun as a verb (e.g., "Let's whiteboard this idea") is a clever, standard way to communicate efficiently.

Frequently Asked Questions

What is zero derivation or conversion in grammar?
Conversion or zero derivation is a morphological process where an existing word transitions into a new part of speech (like changing from a noun to a verb) without altering its spelling or pronunciation. It relies entirely on sentence context to show its function.

Why is it called "zero" derivation?
It is called "zero" derivation because unlike standard derivation where you add an affix (like -ness or -ly), you add "zero" extra letters to the word to change its class.

Can any noun be converted into a verb?
While conversion is highly productive, not every noun works as a verb naturally. However, it is especially common with newly invented technology, tools, body parts, and business jargon (e.g., to shoulder a burden, to bookmark a page).

When adjectives are converted to nouns (like "the rich"), do they take an "s" for plural?
No. When an adjective is converted to represent a group of people (like the rich, the poor, the young), it acts as a plural noun but never takes an "-s" ending. You say "The rich have a lot of money," not "The riches have a lot of money."

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Conversion (Zero Derivation) — Exercise 1

Practice English grammar topic Conversion (Zero Derivation) with 10 multiple-choice questions. Answer at least 70% correctly to pass.

10 questions Passing score: 70% Test 1 /10 answered

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  • Read each question carefully and select the best answer.
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  1. 1

    The word 'light' can be a noun (e.g., 'a light bulb'), an adjective (e.g., 'light weight'), or a verb (e.g., 'to light a candle'). When it functions as a verb, it's an example of conversion from:

  2. 2

    Identify the word that has undergone conversion from a verb to a noun in the sentence: 'Let's go for a swim.'

  3. 3

    Identify the word that has undergone conversion from a verb to a noun in the sentence: 'He took a long walk.'

  4. 4

    Which sentence contains a word converted from a noun to an adjective?

  5. 5

    Identify the word that has undergone conversion from a verb to a noun in the sentence: 'He needs a good sleep.'

  6. 6

    The word 'dry' can be an adjective (e.g., 'dry hair') or a verb (e.g., 'to dry your hair'). This is an example of conversion from:

  7. 7

    Which sentence contains a word converted from a noun to an adjective?

  8. 8

    What is the word formation process when 'butter' (noun) is used as 'to butter the bread' (verb)?

  9. 9

    Consider the word 'figure'. In the sentence 'She has a good figure', it's a noun. In 'Can you figure out the answer?', it's a verb. What type of conversion is this?

  10. 10

    Identify the word that has undergone conversion from a verb to a noun in the sentence: 'She gave a loud laugh.'

Practice Tests

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Related Topics

View all in Word Formation (Morphology)
A2 Basic Suffixes and Word Forms Word Formation (Morphology) B1 Common Prefixes and Suffixes Word Formation (Morphology) B1 Word Families Word Formation (Morphology) B2 Derivation (Prefixes, Suffixes, Root Words) Word Formation (Morphology) C1 Complex Word Formation Word Formation (Morphology) C1 Nominalizations (Deverbal and Deadjectival Nouns) Word Formation (Morphology) C2 Lexicogrammar (Collocation and Fixed Expressions) Word Formation (Morphology) C2 Advanced Morphological Patterns Word Formation (Morphology)
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