She is a real fan of animals, so the snake might/could not be killed by her.
Which option is natural? To me, neither. Well, I think the passive seems irrelevant, awkward and unnatural-sounding.
"might not" suggests, "perhaps, perhaps not", which seems unlikely, whereas "could not" suggests "it would seem unthinkable".
These two versions work for me:
1. She is a real fan of animals, so she could not kill the snake.
2.
She is a real fan of animals, so the snake could not have been killed by her. Thanks,Can you give more details about why you're writing? There are many options. It seems like you're trying to use a modals of judgement.
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Can you give more details about why you're writing?
There are many options.
It seems like you're trying to use a modals of judgement. ?
"I don't think she did it. She is such an animal lover that she could not/could never have killed that snake."