晚上十点以后，请保持安静。

Wǎnshang shí diǎn yǐhòu, qǐng bǎochí ānjìng.

After ten in the evening, please keep quiet.

他性格比较安静，不太爱说话。

Tā xìnggé bǐjiào ānjìng, bù tài ài shuōhuà.

His personality is rather quiet; he doesn’t like to talk much.

夜里很静，我一个人在看书。

Yèlǐ hěn jìng, wǒ yí gè rén zài kànshū.

It is very quiet at night, and I am reading alone.