"How do you say 'sorry' in Thai?" You can refer to this page for common beginner phrases in Thai: http://www.omniglot.com/language/phrases/thai.php

I have to sorry because of my fault ผมขอโทษครับ ผมผิดไปแล้ว I'm sorry ผมขอโทษ or ผมขออภัย ครับ ขอโทษ and ขออภัย maybe use in the same way but "ขออภัย" is more formal than ขอโทษ = Khor Tod ขออภัย = Khor Apai for manner the we used add "ครับ" for a man and "ค่ะ" for a woman ครับ = Kub ค่ะ = Ka (speak shortly)

It says 'Kor Tod Krub' Krub is for man and Kaa is for woman.