You ask: "Can you ...
"Can you help me, please?"
You say: "I don't ...
"I don't know." / "I don't understand."
You ask: "How do you ...
"How do you spell it?"
You ask: "Can I have a ...
"Can I have a copy, please?"
You ask: "Sorry, can you ...
"Sorry, can you repeat that, please?"
You say: "Sorry, I'm ...
"Sorry, I'm late."
You ask: "What page ...
"What page is it?"