The prepositional phrase indicating position is advanced. Must the main clause be inverted?

Isn't this upside down? The normal word order is that books must be left in the house, so there is a partial inversion here.

But not all of them are upside down, but some of them are slang and oral idioms in film and television dramas. It is suggested that it is better to write articles (especially exam compositions) according to the normal conditions in the books that are necessary for home ~

Don't worry too much about these things. Spoken English, Shakespeare's old English and modern written English all have different grammatical structures, and there is not necessarily anyone who is right or wrong, just different occasions and objects ~

I hope it helps you, O(∩_∩)O ~