Non lo so
I do not know
Language note: Can be shortened to just 'non so'.
Culture note: A polite way to express uncertainty or when you can't provide information.
Context: Your friend asks for directions, but you are unsure.
Word-by-Word Breakdown
Non
[nohn]
I don't know
Used when one is unsure or unaware.
Se non sai la risposta, dì: 'Non lo so'.
If you don't know the answer, say: 'I don't know'.
lo
[loh]
it
Refers to something previously mentioned.
Non lo capisco.
I don't understand it.
so
[soh]
know
Possess information or skills.
Vorrei sapere, ma non lo so.
I'd like to know, but I don't know it.
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