Please, thank you, and the basics of being polite.

• ස්තූතියිThank you (stūtiyi; the everyday spoken form)
• බොහොම ස්තූතියිThank you very much (bohoma stūtiyi)
• සමාවෙන්නSorry / Excuse me (samāwenna; to apologize or get attention)
• කමක් නෑIt's okay / No problem (kamak nǣ; also means 'you're welcome')
• කරුණාකරලාPlease (karuṇākaralā; spoken form)
• ඔව්Yes (ow)
• නෑNo (nǣ; everyday spoken form)
• හරිOkay / Alright (hari)
• පින් සිද්ද වෙන්නPlease / Kindly (pin sidda wenna; warm, polite way of asking a favor)
• සුබ පැතුම්Best wishes / Congratulations (suba pætum)
• අවසරExcuse me / May I (awasara; asking permission to pass or leave)
• මට අමතක වුණාI forgot (maṭa amataka wuṇā; polite acknowledgement)