我生病了。

Wǒ shēngbìng le.

I'm sick.

你生病就应该去看医生。

Nǐ shēngbìng jiù yīnggāi qù kàn yīshēng.

When you're sick you should see a doctor.

她生病了，不能去上班了。

Tā shēngbìng le, bùnéng qù shàngbān le.

She got sick; she can't go to work.