པས། or བ། for questions

When do we use པས། and བ། for questions? What is the difference between them?

For example:
ཁོང་སློབ་ཕྲུག་རེད་པས།
ཁོང་དགེ་རྒན་རེད་བ།

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Use -པས། for question questions:

ཁོང་སློབ་ཕྲུག་རེད་པས། ? = “Is she/he a student?”

Use -བ། as a “tag question” (it is a statement, but a hedge):

ཁོང་དགེ་རྒན་རེད་བ། = “She’s/He’s a teacher, right?” (you think you know that they’re a teacher, but you aren’t quite sure, or maybe you don’t want to be impolite and presume that they are, etc.)

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