所以

所以，哪里有问题？

suǒ yǐ， nǎ lǐ yǒu wèn tí？

So where's the problem?

我今天累，所以我睡得早。

wǒ jīn tiān lèi， suǒ yǐ wǒ shuì dé zǎo。

I was tired today so I went to bed early.

汤姆胸痛，所以去了医院。

Tāng mǔ xiōng tòng， suǒ yǐ qù le yī yuàn。

Tom had a pain in his chest, so he went to the hospital.