Bod positive vs negative with past tense

Hi going through the the old course where we go through the use of bod.

For present tense I understand:
Positive: … that she knows = … I bod hi’n gwybod
Negative: … that she doesn’t know = … nag yw hi’n gwybod

Bod becomes nagw.

But for past tense, from what I can hear only the negative uses past tense:

Positive … that she knew = I bod hi’n gwybod
Negative … that she didn’t know = nag oedd hi’n gwybod.

It sounds like you don’t use the past tense when using bod, but you do use it if it’s negative? Is that correct?


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