Can any expert give me some advice on the knowledge of inverted sentences in grammar?

Inversion sentences are divided into full inversion and partial inversion. Full inversion means putting the predicate before the subject, and partial inversion means putting part of the predicate verb before the subject. The reasons are, firstly, grammatical needs, and secondly, rhetorical needs. However, in practical applications, especially in compound sentences, students often cannot tell whether to invert in the main clause or in the subordinate clause. This phenomenon in middle school English is enumerated below.

(1) Inversion in the main clause

1. not only…but also…when connecting two equivalent components

Not only was everything he had taken away from him, but also his German citizenship.

Not only should we not be afraid of difficulties, but we should overcome them.

2. so…that… in structure , when emphasizing the word modified by so, the sentence is inverted

So loudly did he speak that every one of the class could hear him.

So shallow is the lake that no fish can live in it .

3. hardly (scarcely) …when…,no sooner…than… in the structure, when the negative meaning of the word is emphasized

Hardly had I reached the bus stop when the bus started.

No sooner had he arrived home than he was asked to start on another journey.

4. not until at the beginning of the sentence

Not until all the fish died in the river did the villagers realized how serious the problem was.

5. Sometimes to balance the sentences

Gone are the days when we used “foreign oil”.

At last came the day when he was to be thrown to the prison.

(2) Inversion in the clause

1. as-guided concession. Inversion in adverbial clause

Child as he was, he knows a great deal.

Disabled as Paul was, he went on serving the people.

2 . In the subjunctive mood, if the predicate of the clause contains were or had should, omit the if and use inversion

Were I not working, I would be quite willing to do what you ask me to.

Had I known, I might have joined you in the discussion.

3. In the attributive clause introduced by preposition + relative pronoun

They arrived at a farmhouse, in front of which sat a small boy.