I see the Thai fever rising after Thailand got talent contestant Bell video made wave around Singapore and in Facebook. So maybe there are people out interested to learn. So here are the basics:
Hello/goodmorning/good afternoon/bye bye -- sa wat dii
What are you doing? -- Tham arai yu na
Watching tv -- du ti wi yu
Talking on the phone -- kui Toh ra sap yu
Where are you? -- yuu tii nai na
What time? -- gi morng na
How much? -- thao rai na
Have you eaten? -- Kin kao rue yang
Not yet eaten -- yang mai kin
No chance to eat -- yang Mai dai kin
Eaten -- kin leaw
Very full -- im mak
Very hungry -- hiu mak
What did you eat? -- kin kao gap arai na
Just add 'khap' to the back if you are a guy and 'ka' at the back if you're a lady for politeness. Remember it is very important to be polite very meeting new people, so don't forget to speak politely too by adding khap or ka.