Some notation questions

[puerhu]

So, my erhu teacher (I actually have one of those now, woo) has tasked me the attached piece of music to practice playing in another key. (Before last week I thought that 1=G meant that I had to retune the strings ) My understanding (from Wikipedia) is that I should play a "7" as C-natural instead of sharp, and everything else is the same as what I'm used to with D-major. Is this correct?
Also there are now dots below the notes, I believe meaning a lower octave, but how can I play any lower? *Tries down-tuning again* So I assume the system has changed for some reason, and now a 5_no_dot is A5 and 5_dot_below is A4, right? (also, why?) So I should play: A4 B4 | C4 D5 | E5 D5 | C4 B4 ?
And what about the characters above the notes? Does "内" mean that I should play everything on the inner string until instructed otherwise on the next line, or just that one note? And what do the numbers "〇一二三四" represent here?
I would ask my teacher but there is a language barrier that makes communication difficult, so I want to prepare in advance of next lesson. Thanks for any insight

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[d̗̰̗͆͘ǎ͔̱͈̰̬̫ͨ̌ͮͥ͗ͭ̕vid]

Jun 18, 2019 11:35:33 GMT puerhu said:

So, my erhu teacher (I actually have one of those now, woo) has tasked me the attached piece of music to practice playing in another key. (Before last week I thought that 1=G meant that I had to retune the strings ) My understanding (from Wikipedia) is that I should play a "7" as C-natural instead of sharp, and everything else is the same as what I'm used to with D-major. Is this correct?
Also there are now dots below the notes, I believe meaning a lower octave, but how can I play any lower? *Tries down-tuning again* So I assume the system has changed for some reason, and now a 5_no_dot is A5 and 5_dot_below is A4, right? (also, why?) So I should play: A4 B4 | C4 D5 | E5 D5 | C4 B4 ?
And what about the characters above the notes? Does "内" mean that I should play everything on the inner string until instructed otherwise on the next line, or just that one note? And what do the numbers "〇一二三四" represent here?
I would ask my teacher but there is a language barrier that makes communication difficult, so I want to prepare in advance of next lesson. Thanks for any insight

You don’t need to retune the strings. The opens strings will have different numbers for different keys, based on the location of where D or A on that scale. It would be redundant to retune the strings every time you are changing the key of a piece. I’ve posted a chart on reading jianpu. There are many other posts on this forum on jianpu too. 内 means the inner string 外 means the outer string 〇=open strings 一=1st finger 二=2nd finger 三=3rd finger 四=4th finger.