但是

有yǒu什么shénme你nǐ想要xiǎngyào但是dànshì没有méiyǒu的de东西dōngxi吗ma？

Is there anything you want that you don't have?

他tā试图shìtú游yóu过guò河hé，但是dànshì失败shībài了le。

He failed in his attempt to swim across the river.

他tā不bù是shì歌手gēshǒu，但是dànshì个gè演员yǎnyuán。

He is not a singer, but an actor.

这zhè场chǎng秀xiù棒极了bàngjíle，但是dànshì门票ménpiào太tài贵guì了le。

The show was wonderful, but the tickets were too expensive.