She _____ him to translate the document into French because she herself cannot speak French.
couldn’t have helped
shouldn’t have helped
needn’t have helped
mustn’t have helped
Correct answer: A
Needn’t have PII: didn’t have to do anything but did
Couldn’t have PII: could not have done (not sure)
Should have PII: should have done something but didn’t
Do not use mustn’t have PII, but can’t have PII: certainly could not do anything in the past.
She couldn’t help him translate the document into French because she didn’t speak French herself.
→ Choose answer A