Generally, no one plays this kind of sentence connection, because classical poetry is relatively broad, mainly in terms of language sense and content. Language sense conforms to the language style of classical poetry and is not too vernacular.
Generally speaking, according to the rules of modern poetry, there are many such conjunctions, which are a bit like couplets, but simple two-sentence conjunctions do not need to be deliberately opposed, but the metrical formula of flat lines should conform to the metrical formula of the five elements and seven verses. If the last word of the previous sentence is flat, then the next sentence will rhyme with the previous one.
If you don't ask for a level play, you are confused unless your sentence is very, very good and wonderful, which actually doesn't make any sense, just like the previous sentence asking (have you eaten) and the next sentence asking what you can do for (Zhajiang noodles) or (braised pork rice), as long as it's not out of line, it's all correct, which is meaningless.
For example, if you write the last sentence (with the blue line on the north side of the wall), you can write it casually without making metrical requirements, such as:
There is a blue mountain line on the north side of the wall, all of which are red leaves.
There is a blue mountain line to the north of the wall, and the clear water is rippling.
There is a blue mountain line to the north of the Great Wall, where people stand empty and haggard.
There is a blue mountain line to the north of the Great Wall, and Zheng Hong is wearing dusk clouds.
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Don't these guys look good? In fact, it is no different from word formation. There is no need to make metrical requirements. You can pick out fluent sentences. These days are meaningless, just like that wild saying, you know?
Leaves fall like a waterfall, and an almond is coming out of the wall.
Red leaves burn in autumn on the horizon, and an almond goes out of the wall.
The green grass in spring dyed the steps red, and an almond emerged from the wall.
The cry of wild geese makes my sad heart sad, and an almond is coming out of the wall.
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In short, if you don't follow some high-level requirements, your brain will become a joke.