I don't plan to master the Thai language anytime soon, but after being in Thailand for a week, I did pick up a few key phrases that I thought may be helpful for anyone planning a visit to the country. Mostly you'll get by on broken English, but it helps to know a few simple phrases to show you've given an interest in Thai language and culture.
How to say...
(If you're a man): Sawadee-KUP
(if you're a woman): Sawadee-KA
MAI Chai (literally translating to "not yes")
(if you're a man): Cob-kun-KUP
(if you're a woman): Cob-kun-KA
*The sounds in CAPS represent sounds that should be spoken with a high-pitched tone.
**I am not a linguist and the above does not represent any official spelling of these words. They are written phonetically how I perceive them to sound, based on my own personal experience of traveling to Thailand and listening to the locals as well as my Thai-speaking husband.