Formal:
* สบายดีค่ะ/ครับ (sa-bai dee kha/krap) - This is the most common and polite way to say "I'm well" in Thai. You add "kha" if you are female and "krap" if you are male.
* ขอบคุณค่ะ/ครับ (khàawp khun kha/krap) - This means "thank you" in Thai. You can add it after "สบายดีค่ะ/ครับ" to make it a complete phrase.
Informal:
* สบายดี (sa-bai dee) - This is a more casual way to say "I'm well" and can be used with friends and family.
* ดีค่ะ/ครับ (dee kha/krap) - This literally means "good" but can also be used to mean "I'm well" in casual conversation.
* โอเค (oh-keh) - This is a borrowed word from English that means "okay" and can be used as a short way to say "I'm well".
Full phrases:
* สบายดีค่ะ/ครับ ขอบคุณค่ะ/ครับ (sa-bai dee kha/krap khàawp khun kha/krap) - "I'm well, thank you." (formal)
* สบายดีค่ะ/ครับ ขอบคุณค่ะ/ครับ (sa-bai dee kha/krap khàawp khun kha/krap) - "I'm well, thank you." (formal)
* สบายดีค่ะ/ครับ (sa-bai dee kha/krap) - "I'm well." (informal)
* ดีค่ะ/ครับ (dee kha/krap) - "I'm well." (informal)
Note:
* It's important to use the correct gender ending (kha for female, krap for male) when speaking formally.
* When using the informal phrases, be sure to consider the context and your relationship with the person you are speaking to.
I hope this helps!