Language
LanguageThai is a tonal language belonging to the group of Ka-Tai languages, the five tones are monotone, low, falling, high, and rising. This can be a rather complicated language for the visitor; however, English is quite widely understood, particularly in Bangkok where it is almost the major commercial language.
Here are a few Thai basic greetings and phrases to try. Just click on the Thai versions to hear a native speaker pronounce each phrase : 
 
Hello (male speaker) sawasdee krup
Hello (female speaker) sawasdee kaa
How are you? sabai dee reu
Fine thanks sabai dee
Thank you kop koon
Never mind mai pen rai
I can't speak Thai phoot Thai mai dai
I don't understand mai kao chai
Do you understand? kao chai mai
May I take a photograph? tai ruup dai mai
Where is the rest room? hong nam yoo tee nai
How much does this cost? nee tao-rai
What is this ? nee arai
Very expensive paeng maag
The bill please gep taang
Good-bye la gon
See you again laew phob gan mai
Good luck kor hai chok dee
Sorry/excuse me kor thoad
Who sells chicken eggs? Krai kai kai kai