Word: 可是 (kěshì)

他很想回家，可是最后他没有。

Tā hěn xiǎng huíjiā, kěshì zuìhòu tā méiyǒu.

He really wanted to go home, but in the end he didn't.

你们的计划很好，可是我的更好。

Nǐmen de jìhuà hěn hǎo, kěshì wǒ de gèng hǎo.

Your plan is a good one, but mine is a better one.

可是太贵了！

Kěshì tài guìle!

But it's too expensive!

可是我完全不觉得怪啊。

Kěshì wǒ wánquán bù juéde guài a.

But I don't think it's strange at all.

我们十点上课，可是她十一点才来。

Wǒmen shí diǎn shàngkè, kěshì tā shíyīdiǎn cái lái.

We start class at 10, but she didn't arrive until 11.

我想买那辆车，可是我却没有钱。

Wǒ xiǎng mǎi nà liàng chē, kěshì wǒ què méiyǒu qián.

I would buy the car, but I am poor.

我把那本书借给他了, 可是他还没还给我。

Wǒ bǎ nà běn shū jiègěi tā le, kěshì tā hái méi huán gěi wǒ.

I lent that book to him, but he still hasn't given it back.

那天我很想放弃，可是我还是坚持下去了。

Nàtiān wǒ hěn xiǎng fàngqì, kěshì wǒ háishi jiānchíxiàqù le.

That day I really wanted to give up, but I still persevered.