When writing in past tense for fiction, do I have to conjugate the verbs for idioms such as 'therein lies the rub'? Idioms such as 'stand your ground' or 'the apple doesn't fall far from the tree' are much simpler. If so, what would be the proper way to do so?
, part of dialog, you'll most likely be using the tenses that are usual for the saying, proverb, or idiom. If you are making authorial commentary, the same would probably usually apply. , Therein lay the rub.
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If it's a direct quote, i.e., part of dialog, you'll most likely be using the tenses that are usual for the saying, proverb, or idiom.
If you are making authorial commentary, the same would probably usually apply.
Otherwise, you might have to change the tense to fit the story, e.g., Therein lay the rub.
Without full example sentences or paragraphs from your story,