可是

dà jiā suī rán lèi kě shì dōu hěn yú kuài

大家虽然累，可是都很愉快。

We were bone-tired, but felt happy.

tā duì wǒ shuō guo kě shì wǒ wàng le

她对我说过，可是我忘了。

She had told me but I had forgotten.

rén suī rán lǎo le kě shì xīn bù lǎo

人虽然老了，可是心不老。

He is old yet his heart is young.

rèn wù kě shì hěn jiān jù de

任务可是很艰巨的。

The task is by no means easy.

tā kě shì gè liǎo bu qǐ de rén wù

他可是个了不起的人物。

He is simply fantastic.

zhè ge gāng bǐ kě shì hěn guì de

这个钢笔可是很贵的。

This pen is really expensive.