A: May I ask you a favor?
你能帮我个忙吗？
B: Sure, what is it?
当然，什么事？
A: Could you open the door for me? I can't open it.
你能帮我开下门吗？我开不了。
B: OK. Let me try.
好的，让我试试看。

A: Can you help me?
你能帮我个忙吗？
B: Sure, what's up?
当然，什么事？
A: Would you please take those trays away?
你能把那些盘子拿走吗？