Question about 到 and 过

Hello everyone, I'm a bit confused about the grammatical implications of a couple of characters.

As I understand them 到 and 过 function, to some degree, as a form of some 'past action modifier'. How do I know when to use them for a given verb? for instance, 说过 is correct, but is 说道 correct? if not then why not. if so, then how did the meaning get modified?

I did some googling on it but nothing seems to come up related to this question. Thank you.

submitted by /u/damnedturtle
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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/8mrn84/question_about_到_and_过/

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