轻声

qīng shēng shuō huà

轻声说话

speak in muted voices

qīng shēng xì yǔ

轻声细语

say under one's breath

qīng shēng qīng qì

轻声轻气

in a soft tone

pǔ tōng huà zhōng de xū cí niàn qīng shēng

普通话中的虚词念轻声。

In mandarin, particles are all toneless.