When you want to say ' how to do ......?' You just say the word 'yaŋ·ŋay' in Thai.
yaŋ·ŋay is the Thai question word. We always put this word at the end of the question sentences.
Let's see the video below.
Note : ŋ sounds like 'ng' in 'sing, song"
Learn Thai for one minute.
NOK^^
