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I don't know what to do. vs i am not sure what to do

I don't know what to do. vs i am not sure what to do which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I don't know what to do. is the most popular phrase on the web.

i am not sure what to do

11,330,000 results on the web

I don't know what to do.

159,600,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • I am not sure what we have there geshehen.
  • I am not sure what you want.
  • I am not sure what this achieves.
  • I am not sure what I have accomplished coming here.
  • I am not sure what happened.
  • I am not sure what proportionality means.
  • I am not sure what that means.
  • I am not sure what would interest you.
  • Honestly, I don't know what to do.
  • Lieutenant, I don't know what to do.
  • ryong, I don't know what to do.
  • Sometimes I don't know what to do.
  • He just fell over. I don't know what to do.
  • Otherwise, I don't know what to do.
  • Valeria, is sleeping with her tooth under the pillow and I don't know what to do.
  • Sung

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