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B1. - And could you give me...

A1. - Sure. Take a seat.

A2. - ...Could I ask you...

B2. - Of course. What is it?

A2. - Could you tell me...

A3. - ...Can I ask you a favour?

A3. - Could you help me...

B3. - What's the problem?

A4. - Dad, could I borrow...

A4. - ...Can you lend me some?

A4. - ...Can I have five pounds?