how to say to the driver when I hail the wrong bus?
The other day, I was waiting for the bus at bus stop, and then I saw the bus coming in my way, so I hailed the bus. when it pulled in, I realized that it was not the bus I was waiting for. But I was too embarrassed, and for a moment I did not know what to say to the bus driver, because he said to me, " G'day mate, hop on." So I got on the bus, and sat on the seat behind the driver. So what should I say if I encounter the same situation in the near future?

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I guess you are living in Australia. I'm not Australian but I would say, "Oh, sorry. I think this is the wrong bus. I made a mistake. Sorry." Then I would smile and walk away. I'm British so I would be quite apologetic like that.

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Don't get on and just say:

"I'm sorry. Wrong bus. Thank you anyway"

And carry on.

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"Sorry! (Forgive me!). The wrong bus."
"This is a wrong bus for me."
"My mistake! Wrong bus!"
"I caught a wrong bus! I need another one"
"I caught a wrong bus, it seems. I need to change buses."
"Excuse me! But I would like to take different bus."
"Oh no. Seems this is a wrong bus."

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"Sorry, mate. Wrong bus." All with a smile, of course :)
Or, "Sorry, my mistake ... wrong bus"

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Or in New Zealand? 
Another option: You could say something like "I want to go to xxx. Do you go there?". 
If the driver says 'no', they will carry on.

لا تفوّت فرصة تعلّم لغة جديدة وأنت مرتاح في منزلك. تصفّح مجموعتنا المختارة من مدرّسي اللغات ذوي الخبرة وسجّل في درسك الأول الآن!