Four of the most common English endings look similar but sound different: -tion, -sion, -sure, and -ture. Luckily, their pronunciations are predictable. Learn the four patterns and you will handle thousands of words — from nation and vision to measure and future — without guessing.
The Four Rules
-tion → /ʃən/
Always /ʃən/. The ti acts as a palatalized /ʃ/ (sh) sound, and the on reduces to /ən/.
- nation /ˈneɪʃən/
- station /ˈsteɪʃən/
- attention /əˈtɛnʃən/
- information /ˌɪnfərˈmeɪʃən/
-sion → /ʒən/ after a vowel, /ʃən/ after a consonant
This is the rule most learners miss. Look at the letter before -sion.
- After a vowel → /ʒən/: vision /ˈvɪʒən/, decision /dɪˈsɪʒən/, occasion /əˈkeɪʒən/, confusion /kənˈfjuʒən/.
- After a consonant → /ʃən/: tension /ˈtɛnʃən/, mansion /ˈmænʃən/, expression /ɪkˈsprɛʃən/, discussion /dɪˈskʌʃən/.
-sure → /ʃər/ or /ʒər/
Same rule as -sion:
- After a vowel → /ʒər/: measure /ˈmɛʒər/, treasure /ˈtrɛʒər/, pleasure /ˈplɛʒər/, leisure /ˈliʒər/ or /ˈlɛʒər/.
- After a consonant → /ʃər/: pressure /ˈprɛʃər/, censure /ˈsɛnʃər/.
-ture → /tʃər/
Always /tʃər/. The t combines with the u to make the ch sound.
- future /ˈfjutʃər/
- nature /ˈneɪtʃər/
- picture /ˈpɪktʃər/
- culture /ˈkʌltʃər/
Summary Table
| Ending | Sound | Rule | Example |
|---|---|---|---|
| -tion | /ʃən/ | always | nation /ˈneɪʃən/ |
| -sion (after vowel) | /ʒən/ | vowel + sion | vision /ˈvɪʒən/ |
| -sion (after consonant) | /ʃən/ | consonant + sion | tension /ˈtɛnʃən/ |
| -sure (after vowel) | /ʒər/ | vowel + sure | measure /ˈmɛʒər/ |
| -sure (after consonant) | /ʃər/ | consonant + sure | pressure /ˈprɛʃər/ |
| -ture | /tʃər/ | always | future /ˈfjutʃər/ |
Practice Words
Why This Happens: Palatalization
The /t/ or /s/ in these endings is followed historically by /j/ (a y-sound). The two sounds fused:
- /t/ + /j/ → /tʃ/ (as in future)
- /s/ + /j/ → /ʃ/ (as in nation)
- /z/ + /j/ → /ʒ/ (as in vision)
This is the same process behind did you → didju /ˈdɪdʒə/. Once you see it, the pattern becomes systematic.
Exceptions and Special Cases
- question /ˈkwɛstʃən/. After /s/, -tion becomes /tʃən/ instead of /ʃən/. Also combustion, exhaustion, digestion.
- suggestion /səɡˈdʒɛstʃən/. Same pattern as question.
- equation /ɪˈkweɪʒən/. Unusually /ʒən/ even with -tion spelling.
- Older British sometimes keeps /sj/ in issue /ˈɪsju/; American English uses /ˈɪʃu/.
- -tial, -cial, -cious follow the same palatalization: special /ˈspɛʃəl/, social /ˈsoʊʃəl/, precious /ˈprɛʃəs/.
Stress Pattern Bonus
These four endings are unstressable. The stress always falls on the syllable before the ending.
- NA-tion, STA-tion, ad-mi-nis-TRA-tion
- VI-sion, de-CI-sion, con-FU-sion
- PRES-sure, MEA-sure
- FU-ture, PIC-ture, cul-TU-ral (here stress moves with added syllables)
How to Practice
- Write a list of 20 words you use with these endings.
- Mark each with /ʃən/, /ʒən/, /ʃər/, /ʒər/, or /tʃər/.
- Say them slowly, then at normal speed, keeping the ending short and the previous syllable stressed.
- Record yourself. Make sure you are not saying /ti-on/ or /si-on/ — these are NOT native sounds.
Key Takeaways
- -tion is always /ʃən/.
- -sion is /ʒən/ after a vowel, /ʃən/ after a consonant.
- -sure is /ʒər/ after a vowel, /ʃər/ after a consonant.
- -ture is always /tʃər/.
- The stress falls on the syllable just before the ending.