English has a hidden rule that most textbooks skip: when a vowel appears directly before -ng or -nk, it uses a specific set of vowel sounds that do not follow the usual short-vowel pattern.
Understanding this rule explains why words like sing, song, lung, and hang all sound slightly different from similar words without the -ng ending, and why vowels in these positions are sometimes called "tense" before a nasal velar.
The -ng and -nk Sounds
First, a quick reminder: in English, the letters ng at the end of a syllable represent a single sound: /ŋ/. This is the velar nasal, the same sound at the end of "sing," "ring," and "song." You do not pronounce a separate /g/ sound after the /ŋ/ in most American English words.
The letters nk represent two sounds: /ŋk/. The /ŋ/ is followed by a /k/.
The Five Vowel Sounds Before -ng and -nk
Here is the key chart. Notice that the vowel letters before -ng often map to different sounds than you might expect from the short-vowel system:
| Vowel letter | Sound before -ng/-nk | Example words |
|---|---|---|
| a | /æ/ (as in "cat") | hang /hæŋ/, bank /bæŋk/, rang /ræŋ/, tank /tæŋk/ |
| e | /ɛ/ (as in "bed") | length /lɛŋkθ/, strength /strɛŋkθ/, Bengal /bɛŋˈɡɔːl/ |
| i | /ɪ/ (as in "sit") | sing /sɪŋ/, ring /rɪŋ/, think /θɪŋk/, rink /rɪŋk/ |
| o | /ɑː/ or /ɔː/ (as in "song") | song /sɑːŋ/, long /lɑːŋ/, strong /strɑːŋ/, wrong /rɑːŋ/ |
| u | /ʌ/ (as in "cup") | lung /lʌŋ/, sung /sʌŋ/, trunk /trʌŋk/, drunk /drʌŋk/ |
Practice: The -ing Verb Ending
The most common encounter with the /ɪŋ/ combination is the -ing verb ending. The vowel is always the short /ɪ/ sound, never the long /iː/.
Many English learners say "runnING" with a long E sound. Native speakers say /ˈrʌnɪŋ/, with a short /ɪ/ that is barely stressed.
Practice: The -ong and -ung Families
The -nk Words
Before -nk, the same vowel sounds apply. The /k/ sound is always pronounced at the end:
A Common Confusion: /ŋ/ vs. /ŋg/
In most English words, final -ng = /ŋ/ only (no separate /g/). However, when -ng appears in the middle of a word before a vowel, the /g/ IS pronounced:
- sing /sɪŋ/ (no /g/) vs. singer /ˈsɪŋər/ (still no /g/) vs. finger /ˈfɪŋɡər/ (with /g/)!
- hang /hæŋ/ vs. anger /ˈæŋɡər/ (with /g/)
- long /lɑːŋ/ vs. longer /ˈlɑːŋɡər/ (with /g/) vs. longing /ˈlɑːŋɪŋ/ (no /g/)
The pattern: add -er or -est to an adjective or noun, and the /g/ reappears. Add -ing or -er to a verb, and it does not.
Why This Matters
Knowing this rule helps you pronounce entire word families correctly. If you know "sing" uses /ɪ/, then "singer," "singing," and "sang" all follow predictable patterns. The nasal /ŋ/ is produced by closing the back of your mouth while air flows through your nose. Practice by humming the sound "ng" and feeling the vibration in the back of your throat.