neither could I have

[ademoglu]

Hi,

''She couldn't have murdered Arlena. Neither could I.''

I've come across the above in the move 'EVIL UNDER THE SUN.' And I'd like to ask if we can add 'have' after 'I' or not:

She couldn't have murdered Arlena. Neither could I have.

It seems good to me but wordy. Am I right?

Thank you!

 

[GoesStation]

Only "neither could I" is correct. A longer, less elegant way to respond negatively to such a statement is "I couldn't have either."