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I know English has inversion features. And So does my first language.

She can speak Swahili and so can I.

— this sounds totally correct.

Then how about using as instead of so:

She can speak Swahili and as can I.

— this sentence reads little kind of strange though. regarding “as do I.” is grammatically correct, what do you say about this one.

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The sentence "She can speak Swahili and as can I." is grammatically incorrect. You have two conjunctions in this sentence: "and" and "as". By removing the "and", the sentence becomes proper:

She can speak Swahili as can I.

In your first example, "so" is not being used as a conjunction, it's being used to mean "too", so it's fine.

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  • Sweet! Your very answer makes sense, thank you.
    – Tiz
    Apr 30 '20 at 14:52

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