D just finished the first private tutorial English lesson with his colleague (the Dr. in creative writing).  His comment is "Wow, excellent".  Obviously, he enjoys going back to basics after leaving school for so many years.  Somehow, he wants to change to a more British accent, so his colleague adjusted his pronunciation of "n", "l", "r", "th" (in fact, he didn't recognise he shares such problems).  For most HK students, no one really teaches them how to pronounce different sounds correctly or speak with appropriate intonation.  I had the privilege to be taught by various foreign teachers who were very strict with my pronunciation (you can't imagine how they take every "th" seriously).  It was not until I entered university that I realised the benefit of this when the foreign teacher in "English for Law" made one of the most unforgettable compliments in my life - "Gal, you speak like the Queen of England!" 
I must say my oral English has "deteriorated" a bit these years due to the lack of practice (even when I was a lawyer, I spoke Mandarin more than English).  Last Wednesday, I need to accompany an Australian colleague to do an outdoor project all day long.  The most enjoyable thing is, I finally got the chance to speak English all day!  I even taught her a couple of Cantonese phrases which she successfully picked up before leaving HK. 
I also want someone to improve my pronunciation!