If you're a non-native speaker of English, learning how to correctly pronounce "tertiary" can be challenging. The correct pronunciation of this word is "tur-shee-er-ee," with the emphasis on the first syllable.

Start by saying the word "tur," with the "u" pronounced as in "burn." Next, say the sound "sh," as in "sheep." Then, say the sound "ee," as in "bee." Finally, say the sound "er," as in "her," and the sound "ee," as in "bee," once more. Be sure to emphasize the first syllable, and you will have the correct pronunciation of the word "tertiary."

You can practice pronouncing "tertiary" with the help of audio recordings or by repeating it after a native English speaker. You can also practice by saying the individual syllables out loud, focusing on the sound and intonation of each syllable. This will help you master the correct pronunciation of the word.

In conclusion, the correct pronunciation of the word "tertiary" is "tur-shee-er-ee," with the emphasis on the first syllable. With some practice and guidance from a native English speaker, you can easily learn how to correctly pronounce this word.