He didn't come today; perhaps he's ill.

他今天没来，许是生病了。

《新英汉大辞典》

He didn't come to classes today, so I guess he doesn't feel good.

他今天没来上课，所以我猜他一定是不舒服了。

youdao

The classroom can't have been cleaned by Li Ping because he didn't come to school today.

教室不可能是李平打扫的，因为他今天没来上学。

youdao