1. x : could you come to my house tomorrow morning?
    y : i'm sorry i can't. i have a meeting. maybe next time
    x : ok, never mind
2. x : excuse me, could you please tell me how to get to the post office. i want to send a letter. i came here only yesterday.
   y : certainly, go ahead. and then turn right, the post office is on your right.
   x : thanks for your explanation
3. x : excuse me, do you know where the BCA Bank is?
     y : yes, just go straight down this road and it is on your right
   x: thank you. by the way, can you tell me how to get to the subway station from the bank?
   y : sure, you have to take the no.10 bus and get off in Merdeka street. the subway station is there
   x : are you sure sir? as far as i know, the guide book inform us that we have to take no.14 bus.
   y : oh i'm sorry. yes you're right. i confused the no.10 bus with the no.14 bus.
   x : ok thank you.
   y : you're welcome.