Please, thank you, sorry — the words that keep you polite.

• براہِ کرمbarā-e-karamplease (formal)
• مہربانیmehrbānīplease / kindness (common in requests)
• شکریہshukriyathank you
• بہت شکریہbahut shukriyathank you very much
• کوئی بات نہیںkoī bāt nahīnyou're welcome / it's nothing
• معاف کیجیےmuāf kījiyesorry / excuse me (formal)
• معذرتmāzratapology / I'm sorry
• جی ہاںjī hānyes (polite)
• ہاںhānyes (informal)
• جی نہیںjī nahīnno (polite)
• نہیںnahīnno
• بے شکbe-shakof course / certainly