Didn't observe vs haven't observed

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Looking on the internet deeply has found these results:

didn't observe is the most popular phrase on the web. 

haven't observed

182,900 results on the web

didn't observe

1252,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • I have been observed by Americans before.
  • Until Miss Herman observed this and intervened.
  • Events associated with withdrawal syndrome have been observed outside the therapeutic range.
  • Adverse events observed included granulocytopenia, dizziness and paraesthesia.
  • No incompatibilities have been observed between Zevalin and infusion sets.
  • As of right now, we haven't observed any action taken by the North.
  • Haven't you observed she can't stand me, your Giulia?
  • My scouts also observed another Confessor on the hill.
  • It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

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