Sa•wat dee Hello, or goodbye; good morning, good afternoon, good evening, a polite greeting or farewell used when meeting or parting.

Sa•baay dee reuu How are you?

Bpen yang ngai baang How's it going? (an informal greeting).

Nee thao rai How much is this?

Koon aa•yoo thao rai How old are you?

Mai bpen rai It doesn't matter; never mind.

A•rai gaw dai That option would also be fine; whatever.

Bpai nai Where are you going?

Koon phuut phaa•saa ang•grit dai mai Can you speak English?

Mai ao I don't want it.

Khawp koon maak Thank you very much.

Mai ao phet Please make the food not-spicy.

Ao phet maak Please make the food spicy.

Phuut chaa•chaa naawy
Please speak slowly.

A•rai na What? huh?

Koon yuu thee nai Where are you?

Mai chai I don't think so.

Laaeo phohp gan mai See you later.

Gee mohng What time is it?

Mai khao jai
I don't understand.

Phohm bpen kohn a•meh•ri•gaa I am an American (male).

Ka or Krup added to the end of a phrase adds politeness

Phohm and Dichan means "I" for male and female respectively.
Thai Language
The Thai language is a tonal language where the meaning of a word is based on the tone or pitch.  There are five tones and therefore possibly five meanings to one word.  For example, the word "kao" can be pronounced with a low tone to mean "news," falling tone to mean "rice," and a rising tone to mean "white".  The written language is composed of 44 consonants and 15 basic vowel characters. Thai grammar is much easier to understand as there are no complex verb tenses.  Below are some easy although useful Thai phrases to learn. 
Travel Thailand
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Rice in Thailand
Herbs and Spices
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Thai Language
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