Formal:
* ฉันเป็นคนไทย (chan pen khon thai) - This is the most common and formal way to say it. It literally means "I am a Thai person."
Informal:
* ผมเป็นคนไทย (pom pen khon thai) - This is the informal version used by men.
* ฉันเป็นคนไทย (chan pen khon thai) - This is the informal version used by women.
* เราเป็นคนไทย (rao pen khon thai) - This is a more casual and inclusive way to say it, used when speaking to someone you're close to. It literally means "we are Thai people."
Even More Casual:
* ผมไทย (pom thai) - This is a very casual way to say "I'm Thai" used mostly among friends.
* ฉันไทย (chan thai) - This is the female version of the casual "I'm Thai."
Remember to use the appropriate pronoun (ผม/pom for men, ฉัน/chan for women) depending on your gender and the level of formality required.