他从来不把我的话当回事。
tā cónglái bù bǎ wǒ de huà dànghuíshì 。
He never takes what I say seriously.
你应该把这件事当回事。
nǐ yīnggāi bǎ zhè jiàn shì dànghuíshì 。
You should take this matter seriously.
很多人不把感冒当回事。
hěn duō rén bù bǎ gǎnmào dànghuíshì 。
Lots of people don't take colds seriously.