je suis pas sûr(e) : I'm not sure informel
je ne suis pas sûr(e) : I am not sure formel
je ne suis pas sûr(e) que (ce soit vrai) : I'm not sure whether (that's true)
Note that we need to use the subjunctive after je ne suis pas sûr que.
Cela m'étonne beaucoup, je ne suis pas sûr que ce soit vrai.
  • "Maintenant que j’y pense, je ne suis pas sûre non plus que tu saches lire, Thierry."
  • "Enfin, je suis pas sûr."

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