N2 — outside your level filter
write + must do
kaka neba naranai
must do; is obliged to do (written)
meaning: must write
我々はこの問題に対処せねばならない。
wareware wa kono mondai ni taishose neba naranai.
We must deal with this problem. neutral
個人情報の取り扱いには、細心の注意を払わねばなりません。
kojin jouhou no toriatsukai ni wa, saishin no chuui o harawaneba narimasen.
The handling of personal data demands the utmost care. formal