on Just Publishing Advice:

You mostly use inversion in English for questions

Inversion is when you place the verb before the subject. We use this type of inversion in question forms using the verb to be, modal and auxiliary verbs.

Inversion simply means changing the word order from the subject and then the verb to the opposite.

For example, you are happy becomes, are you happy? Or, I can help you, changes to, can I help you?

It is very easy grammar. But we can also use inversion in a sentence when it is not a question, which is not quite as simple.

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