Let me restate my question to clarify:
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ORIGINAL POST:
In what case do you move the regular verb (rather than an auxiliary verb) to the beginning of a sentence to form so-inversion?
Is it necessary or optional?
- Tom has lots of books, and so does his father.
- Tom has lots of books, and so has his father.
- Tom speaks French, and so does his son.
- Tom speaks French, and so speaks his son.
----
ORIGINAL POST:
In what case do you move the regular verb (rather than an auxiliary verb) to the beginning of a sentence to form so-inversion?
Is it necessary or optional?
- Tom has lots of books, and so has his father.
- Tom has lots of books, and so does his father.
- So began the nation.
- So did the nation.
- So spoke he.
- So did he.
- Thus Spoke Zarathustra.
- Thus did Zarathustra.
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