Hi Anon No, the word 'to' is not optional. However, even with the word 'to', the sentence is extremely awkward. It's not a natural-sounding passive sentence.
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We weren't explained to why he had done such terrible things.This seems to be an incorrect version of the following sentence:
AnonymousThere is a sentence: We weren't explained to why he had done such terrible things.Your sentence is incorrect. The structure you are using is possible with some verbs but not with explain. There is no rule or reason for this, English just isn't the most logical of languages. It is sometimes possible to use either