illness没有动词形式,如果表达生病可以用get ill.
1. illness释义:n.疾病;(身体或精神上的)病;患病期;
例句:
It'll take her time to recover from the illness.
她康复需要时间。
missed a lot of school through illness last year.
我去年因病耽误了很多功课。
2. get ill 释义:生病
例句:How did he get so ill?
他怎么病成这样了?
We could get ill from living there.
住在那里,我们可能生病。