我们以普通话教学为主。

Wǒmen yǐ Pǔtōnghuà jiàoxué wéi zhǔ.

We mainly teach in Mandarin.

请大家尽量小声说话，以保持环境安静。

Qǐng dàjiā jǐnliàng xiǎoshēng shuōhuà, yǐ bǎochí huánjìng ānjìng.

Everybody please speak as softly as possible to preserve the peaceful environment.

医生说我不应该喝酒，请让我以茶代酒吧。

Yīshēng shuō wǒ bù yīnggāi hējiǔ, qǐng ràng wǒ yǐ chá dàijiǔ ba.

The doctor said I shouldn't drink alcohol, please let me substitute tea for alcohol.