• I wonder if I might use your pen.
• I wonder if you would lend me your pen.
• Can you bring me the file?

• Give me that/your pen.
• I want you to give me your pen.
• You must bring me that file.

2. Refusing

• I'm sorry I can't attend the meeting because I'll be at the dentist.
• I would attend the meeting, but I have a dental appointment.

• No, I won't/can't attend the meeting.

3. Accepting an Apology

• No problem.
• That's OK.
• I understand.
• Don't worry about it.

• Don't let it happen again.
• Don't ever do that again.
• If you do that again, I'll never forgive you.