2 sentences

1. 我们本不必担心数学考试。

   wǒ​men běn bù​bì dān xīn shù​xué kǎo shì.

   We need not have worried about the math exam.

   Source: UM-Corpus: Spoken

2. 我不关心数字。

   wǒ bù guān​xīn shù​zì.

   I don't care about numbers.

   Source: CCMatrix