Question: When do taekwondo students need to know certain Korean words?
About the article "Taekwondo", section "Korean commands".

Candidate passages:
In Tang Soo Do, as in Taekwondo, commands and terminology to students are often given in Korean.
However, beginning in 1955, and again in 1973, with the formation of the WTF,Taekwondo became centrally governed and Taekwondo terminology was revised, favoring Korean terminology.
Tang Soo Do commands pre-date these revisions and many are based on Sino-Korean words. 
In taekwondo, Korean language commands are often used.
Korean numerals may be used as prompts or commands, or for counting repetition exercises.
Often, students count in Korean during their class, and during tests they are usually asked what certain Korean words mean.
These words are fairly common amongst taekwondo schools, but accuracy of pronunciation can vary widely.
While the Japanese term is most well known in the English language, forms are by no means exclusive to Japan.
They have been recorded in China as early as the Tang dynasty, and are today referred to in Mandarin as "taolu".
South and Southeast Asian martial arts incorporate both preset and freestyle forms.
In silat these are referred to as "jurus" and "tari" respectively.
Malay folklore credits the introduction of forms to the Buddhist monk Bodhidharma.
In Korean martial arts such as taekwondo and tangsudo, the word "hyung" or "hyeong" is usually employed, though in some cases other words are used.
The International Taekwon-Do Federation uses the word "tul", while the World Taekwondo Federation uses the word "poomsae" or simply the English translations "pattern" or "form."
Taekwondo patterns have multiple variations including "Palgwe" and the more popular "Taeguk" forms used by the WTF.
Forms are included in certain taekwondo competitions and are a key element of gradings.
Other Asian martial arts refer to forms by various terms specific to their respective languages, such as the Burmese word "aka", the Vietnamese "quyen" and the Kashmiri "khawankay".
In the Historical European martial arts and their modern reconstructions, forms are referred to as plays, drills or flourishes. 
He is one of the most readily recognized leaders in the Taekwondo community, boasting a thriving Taekwondo school, Black Belt World (www.taekwondo.ca), with branch locations in Woodbridge, Mississauga and North York.
Headquartered in the heart of Korea Town in Toronto, Black Belt World offers curricula, Olympic sparring, and weapons training in Taekwondo for students of all ages.
Recently, a new location in Atlanta, Georgia, was opened with Black Belt World Atlanta.
Master Chang’s career is marked with several milestones including being elected Vice President Sport of Taekwondo Canada, having been the Canadian Taekwondo Team Manager for the 2nd Korean Open in 1999, as well as the Canadian National Team Manager and Coach for the 1999 Taekwondo World Championship in Turkey.
He also held several offices such as Vice-Chairman of the World Tae Kwon Do Association of Canada (Tournament Committee), Pan-American Tae Kwon Do Union Tournament Vice-Chairman (2004–2006), and Pan-American Tae Kwon Do Union Financial Committee Chairman (2004–2006).
At the provincial level, he also served as the Ontario Taekwondo Association Chairman from 2007 to 2008.
He is the past 1st Vice-President of the Ontario Taekwondo Association. 
Uhm Woon Kyu was the fourth Chung Do Kwan Kwan Jang, after Lee Won Kuk, YOO Ung Jun and Duk Sung Son.
He is also a previous leader of the Chung Do Kwan, as well as the ex-President of the Kukkiwon, succeeding longtime President Kim Un Yong.
Uhm's nickname was "Sliding Side Kick God," due to his unmatched ability with that technique.
Reportedly, he could kick an opponent from ten feet away using it.
Uhm helped devise the current rules governing modern Taekwondo free sparring, and is one of the pioneers responsible for the formation of modern Taekwondo.
He was also Special Instructor for the South Korean Military.
He also played a large part in the formation and development of the Korea Taekwondo Association, the World Taekwondo Federation and the Kukkiwon (World Taekwondo Headquarters).
As one of Lee Won Kuk's original and first students, Uhm remains a link to the earliest days of Taekwondo.
As Head of Chung Do Kwan and President of the Kukkiwon, he spent decades ensuring that Kukki Taekwondo retains the power, etiquette, high technique, manners, and Way that makes it one of the world's preeminent martial arts.
He is one of the most important Taekwondo figures in Korea, and one of the most important in the world today.