#1 is not grammatical. #2 is grammatical.
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Anonymous2. An elephant has not been seen by anybody.OK.
Anonymous1. Not has an elephant been seen by anybody.No. The inverted form is "Not [an elephant / a single elephant] has been seen by anybody".
CalifJim"Not [an elephant / a single elephant] has been seen by anybody".Is it the same as "No elephant has been seen by anybody"?
AnonymousIs it the same as "No elephant has been seen by anybody"?It is. It is.