Thai

Thai is the official language of the Thai people, originating from the southern region of China. Historically Thai is also known as Siamese and has many similarities with Lao. Thai is a language whose tonal coordination, complex spelling rules, and distinctions in tonal systems make Thai difficult to learn for those who have never used the language before.

More than half of Thai vocabulary is borrowed from Old Khmer, Pali, and Sanskrit. Thai has 44 consonants, plus 9 vowels written in 14 different ways. 16 of the 44 consonants are unnecessary because only 28 are basic, the rest are compound consonants. In addition, there are 4 accent marks (mean, rough, tri, and chop-ta-wa), the second difficult point of Thai is that Thai texts are read from left to right, and between words in the text. The same sentence doesn't leave any space for example "ที่นี้มีโรงรถไหม ครับ / คะ?", which certainly causes many difficulties for beginners to learn Thai.

Native speakers: 20 - 36 million

Refer to: https://en.wikipedia.org/wiki/Thai_language