I don't know it vs I'm not sure

Quand utiliser chacun en anglais, avec le sens, le registre et des exemples.

I don't know it

Top 2000 (courant)

I'm not sure

Bloc à haute fréquence
Le plus courant: I'm not sure
 I don't know itI'm not sure
Prononciation🇬🇧 //aɪ dəʊnt nəʊ ɪt//🇺🇸 //aɪ doʊnt noʊ ɪt//🇬🇧 //aɪm nɒt ʃʊə//🇺🇸 //aɪm nɑt ʃʊr//
SensI am not sure about it.I don't know if it's true or not.
ExempleAfter hearing the question, I replied, 'I don't know it.'I'm not sure if it will rain tomorrow.
RegistreNeutreNeutre
FréquenceTop 2000 (courant)Bloc à haute fréquence
Collocationsdon't know it well, don't know it anymore, don't know it at allI'm not sure about that, I'm not sure if, I'm not sure what to do
Erreurs fréquentesUsing 'know' incorrectly with a subject (e.g. 'I don't know he')., Omitting 'it' when referring to a specific thing (e.g. 'I don't know')., Confusing with 'I don't understand' which implies confusion, not lack of knowledge.Using it too formally in writing., Confusing it with 'I'm not certain' - which is slightly more formal., Overusing it in situations that require decisiveness.
Notes d'usageUsed to express uncertainty or lack of knowledge about a topic; appropriate in both formal and informal contexts.Used when expressing doubt about something. Common in conversations but less formal in writing.

Vois-le dans de vrais extraits

I don't know it
I'm not sure

Questions fréquentes : I don't know it vs I'm not sure

Quelle est la différence entre I don't know it et I'm not sure ?

I don't know it: I am not sure about it. I'm not sure: I don't know if it's true or not.

Lequel est le plus courant : I don't know it et I'm not sure ?

I'm not sure est le plus courant dans l'anglais de tous les jours.

Peux-tu montrer un exemple de chacun ?

I don't know it: After hearing the question, I replied, 'I don't know it.' I'm not sure: I'm not sure if it will rain tomorrow.

Puis-je utiliser I don't know it et I'm not sure de façon interchangeable ?

Pas toujours. I don't know it et I'm not sure sont proches et se recoupent parfois, mais elles diffèrent par le registre, la fréquence et l'usage, donc remplacer l'une par l'autre peut changer le sens ou le ton. Regarde les différences ci-dessus avant de substituer.

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