How to say "Please" in Khmer

Instruction:

• English: Please (offering)
• Khmer: សូម​អញ្ជើញ (Sohm Anh-jeunh)

Or

• English: Please (asking for something)
• Khmer: សូម​ (Sohm)

 Or 

• English: Please (asking someone to do something)
• Khmer: ជួយ (Joouy)