Here are the rewritten versions of each sentence, correcting the double negatives:
-
Nobody saw nothing coming.
Nobody saw anything coming. -
Nobody hardly saw that coming.
Nobody hardly saw anything coming. (or simply, "Hardly anyone saw that coming.") -
We didn’t see nothing coming.
We didn’t see anything coming. -
Nobody saw anything coming.
(This sentence is already correct.) -
Somebody hardly saw nothing coming.
Somebody hardly saw anything coming. (or "Hardly anybody saw anything coming.")
These corrections eliminate the double negatives and clarify the meaning of the sentences.