Your description reminds me of Cobol.
> I learned English words like while, for and next from qbasic, for real (it had good help in your local language)
I replaced the word your with the word my in my head without conscious effort. I don't know if it is correct but it is kind of what I expected as I skimmed through the sentence.
There was an article or something saying when we read we can read fast because we don't read every word but rather try to auto complete as we go.
Bear in mind that this is Classical Chinese, not modern Mandarin. For example, as you can see in the helpful gloss a couple levels up, 是 in Classical Chinese is the demonstrative "this". (Whereas in modern Mandarin, 是 is the copula "to be [equating two nouns]", and "this" is 这 or perhaps 本.)
It's amazing how durable some of this stuff is, especially if you look at it from the perspective of recipients of Middle and Classical Chinese culture (such as Japan).