I don't know vs i didn't know

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Looking on the internet deeply has found these results:

i don't know is the most popular phrase on the web. 

i didn't know

1153,000,000 results on the web

i don't know

1845,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • I didn't know that I qualified as an army.
  • What? I didn't know
  • I didn't know you prefer men.
  • But I didn't know it either.
  • diet or regular.
  • I didn't know that my father could stop loving me.
  • You were scared... I didn't know that.
  • I didn't know he competed at the '88 Olympics either.
  • It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

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