Subject + 生病 + 了
生病 (shēngbìng) means "to be sick" or "to fall ill," a common verb-object compound in everyday Chinese. It describes the state of becoming unwell or having an illness. It is often used with 了 to indicate the onset of sickness.
他生病了,今天不能去上班。
Tā shēngbìng le, jīntiān bù néng qù shàngbān.
He is sick and can't go to work today.
换季的时候特别容易生病。
Huànjì de shíhou tèbié róngyì shēngbìng.
It's especially easy to get sick when the seasons change.
孩子一生病,全家人都跟着着急。
Háizi yī shēngbìng, quán jiā rén dōu gēnzhe zháojí.
When a child gets sick, the whole family worries.