Word Stress

Suffixes and Word Stress: Easy Rules for Learners

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Published on by Emma Grace • Revised on
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In English, small endings called suffixes can completely change not only the meaning of a word but also how we pronounce it. When you add a suffix, you often need to change the word stress, which means saying a different part of the word more strongly. For English learners, understanding how suffixes affect stress is essential for speaking clearly and sounding natural. This page will discover the most common suffixes, learn when stress stays the same and when it shifts, and get practical tips to improve your pronunciation.

Suffixes and Word Stress

Acronyms 1 4 scaledPin

Suffixes are letters or groups of letters added to the end of a word to change its form or meaning. For example:

  • happy ➡️ happiness
  • create ➡️ creation

Word stress means saying one syllable in a word more strongly than the others. For example:

  • TAble (first syllable stressed)

  • beGIN (second syllable stressed)

When you add a suffix, sometimes the stress stays in the same place, and sometimes it shifts.

Common Suffixes That Usually Don’t Change Stress

Some suffixes do not change the stress of the original word.
Examples:

✅ -ful

  • BEAUtiful (BEAU stressed)

  • WONderful (WON stressed)

✅ -ness

  • HAppy ➡️ HAppiness

Happy:

Happiness:

  • TIred ➡️ TIredness

Tired:

Tiredness:

✅ -ly

  • QUICK ➡️ QUICKly

Quick:

Quickly:

  • SLOW ➡️ SLOWly

Slow:

Slowly:

✅ -ment

  • DeVElop ➡️ DeVElopment

Develop:

Development:

  • AgREE ➡️ AgREEment

Agree:

Agreement:

Tip: When you add these suffixes, stress usually remains on the main syllable of the base word.

Suffixes That Often Shift the Stress

Some suffixes move the stress to a different syllable, often towards the suffix itself or earlier in the word.

✅ -ic

  • phoTOgrapher ➡️ photoGRAphic

photographer: stress on second syllable

photographic: stress moves to the third syllable

  • geOlogy ➡️ geoLOgic

geology

geologic

✅ -ity

  • Equal ➡️ eQUAlity

Equal

Equality

  • PERsonal ➡️ persoNAlity

Personal

Personality

✅ -ion

  • comBINE ➡️ combiNAtion

Combine

Combination

  • inVITE ➡️ inviTAtion

Invite

Invitation

✅ -eous / -ious

  • INstant ➡️ instanTAneous

Instant

Instantanous

  • MYSTery ➡️ mysTErious

Mystery

Mysterious

Tip: Be careful! These suffixes often change stress from the base word, so practice listening and repeating.

Quick Reference Table

Suffix Stress Effect Example
-ful No change BEAUtiful
-ly No change SLOWly
-ness No change HAppiness
-ment No change aGREEment
-ic Moves stress to the syllable before -ic ecoNOmic
-ity Moves stress earlier in the word eQUality
-ion Moves stress before the suffix combiNAtion
-eous/-ious Often moves stress earlier mysTErious
A2 Knowledge Check · 5 questions

Suffixes And Word Stress Practice Quiz (A2-B1)

1 / 5
Q1

Question 1: When we change 'educate' to 'education,' the stressed syllable moves. What is this an example of?

Question 1 options
Adding the suffix -ion to 'educate' causes the stress to shift from 'ED-u-cate' to 'ed-u-CA-tion.' This change in which syllable is said more strongly is called a stress shift caused by a suffix.
Q2

Question 2: Which sentence correctly describes the stress pattern when a suffix is added?

Question 2 options
The word 'electric' with the suffix -ity becomes 'electricity,' and the stress shifts to a different syllable (e-lec-TRI-ci-ty). The other options incorrectly claim that -ful, -ness, or -ly cause stress shifts, but these suffixes keep stress unchanged.
Q3

Question 3: In a pronunciation guide, you write: 'When -ity is added to the word curious, the stress moves to ___.' Which option best completes this sentence?

Question 3 options
When -ity is added to 'curious' to form 'curiosity,' the stress shifts to the syllable 'os' (cu-ri-OS-i-ty). The suffix -ity typically moves stress to the syllable just before it.
Q4

Question 4: You are writing a study guide for classmates about English suffixes. Which option is the most appropriate way to explain how -ness works?

Question 4 options
A good study guide for classmates should be clear, give an example, and be accurate. The option about -ness not changing stress with the example of 'kind' to 'kindness' is correct, clear, and appropriate for a student audience.
Q5

Question 5: Every suffix in English changes the stress pattern of the base word.

Question 5 options
This is false. Many common suffixes such as -ful, -ness, -ly, and -ment do not change the stress of the base word. Only certain suffixes like -ic, -ity, -ion, and -eous/-ious typically cause a stress shift.
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