So do I the above comment.I'm teacher in Thai Language that you asked it's very difficult for beginner.Okay Thai might be the same as Chinese but if you wanna learn about Thai.You just speak out and Don't need to learn about Tri-consonants in Thai because it's not like a Pin-In in Chinese that I think so.That's it. Finally I'm glad to see post in Thai .Keep practicing

Let me tell you just a little bit. Above article is quite advance grammar of Thai language, I think even Thai adult people may not know about that very well. If you don't want to be a Thai language expert, that's is not that necessary to know. ps : This is just my opinion.