我很喜欢做运动，可是我常常受伤。

Wǒ hěn xǐhuān zuò yùndòng, kěshì wǒ chángcháng shòushāng.

I really like doing sports, but I often get injured.

可是，我觉得那件蓝色的更好看。

Kěshì, wǒ juéde nà jiàn lánsè de gèng hǎokàn.

But I think that blue one is more pretty.

她比较聪明，可是脾气不好。

Tā bǐjiào cōngming, kěshì píqi bù hǎo.

She is rather smart, but her attitude is bad.