I think that's fine though. Perhaps, it can be "Excuse me sir, but may I know how should I address you?" Think it's a bit lengthy in my opinion. =/

Alright, here's another one on telephone etiquette. Let's say you are on the line and the person on the other side is looking for you (Good morning Sir/Madam, may I speak to Mr/Ms. [insert your name here]?), which of the following is the appropriate response?

1) Speaking.

2) This is he/she.

Are there any distinctions between the above two? The first one is by far the most common response and as for the second one, it's hardly used here in Malaysia (don't know about other countries) from what I have observed.

Also, are there any other responses besides the above two? Mind sharing them?

P.S If there are any grammatical errors, do point them out. 

EducationABC,
My mother tongue language, as defined by the Oxford's Advanced Learners Dictionary to be my first language, is the English Language and is quite manipulative of my accent.
So far, I'm grown naturally to understand Malay Language, simple Iban, Mandarin and other Chinese dialects including Hokkien, Cantonese, Hakka and Foochow. Now, I'm interested in mastering them as well as other Chinese dialects or any local languages before even thinking of pursuing foreign languages.
How about you?

English grammar should be the same irrespective of the user, whether British, American or German.  But, like you have mentioned, the pronunciation may differs.  And not only that, the spelling of some words differ too.  Examples are, "labour" and "labor", "analyse" and analyze" and lots more.

All our spell check and grammar check on our computers are using American English, since they are from American softwares.

Sorry for the late reply. My first language is......well I can't be sure which language is it! English is usually used for reading and writing(in almost every case, apart from a few mandarin homework and newspapers) while Chinese is used 85% of the time in conversations. The remainder is English and and a few Malay sentences used to communicate with teachers. In my school, Chinese students are the majority, obviously I live in Selangor.

1) Speaking - Not fluent in any languages that I have learned. For Mandarin, I use sentences with slight grammatical errors, sometimes serious ones and I am not fluent unless I am reading out aloud. Malay is almost nonexistent, but I could still read. As for english, I speak Manglish in daily conversations, but I could write a good script.

2) Reading
a) English-- upper intermediate.

b) Mandarin-- lower intermediate(I guess, I got A for PMR, not exactly rare, but not common either, considered "good" in class)

c) Malay-- I don't know, no problem understanding anything so far.

3)Writing
a) English-- Best among three, upper intermediate (Still, grammatical errors are there, try spot one in this post!)

b) Mandarin-- Lower intermediate, grammatical errors are few only because I don't use complex sentences often. Considered "good" in class. The truth is, the standard of mandarin is quite low in Malaysia, so I don't really know where I stand.

c) Malay- 60 to 80 out of 100 on SPM karangan, depending on the topic and time allocated.

Listening- Not quite a problem for any of the three languages.
2) Yes, I believe you. I was once that type of person.

3) Yes, I believe you. I have never heard about it before.

Of course there are exceptions, but generally, I agree with you. The first language that I have learned is English in kindergarten. But during 6 years of schooling in a SJK{C} school, I have immersed myself totally in chinese language and culture. It made English almost nonexistent in my daily life for that period, resulting in my poor English. After standard 6, I entered a SMK school and I immediately put in effort to improve my english. My english improved, but the negligence of Chinese language and the fact Smk schools have only 90 minutes of Chinese language lessons had worn off the edge I initially have in Chinese language. Now, I am lost between the two. Well, not exactly lost but it makes me hard to say which is my first language. I mean, when people ask you what is your first language, they often expect you to be proficient in that language, right?

I guess you are chinese as well, right?
Oops, I have used that a little too often. 

^

Roger that , Great video

But, the guy has some grammatical errors in his speaking ..