The phrase "a school has warned" is correct and usable in written English.
It can be used when reporting a caution or alert issued by a school regarding a specific issue or concern.
Example: "A school has warned parents about the potential dangers of social media use among teenagers."
Alternatives: "a school has cautioned" or "a school has alerted".
A prominent Scottish bagpiping school has warned pipers around to world to clean their instruments regularly after one of its longtime members nearly died of a lung infection caused by fungi growing inside his bag.
A friend from high school had warned her to avoid an awful ex-boyfriend of hers, David Herskovits, who was studying classics there.
Emma Wolin, a junior at Columbia High, walked out of second-period Spanish with several classmates, even though the school had warned that they would face detention.
"If the school had warned us, maybe we'd have been more willing to the idea of them being there," says Clancy, now an anthropology undergraduate at the LSE.
A quarter of schools rated as outstanding may be downgraded from this autumn, the chief inspector of England's schools has warned.
The crisis in children's mental health is far worse than most people suspect and we are in danger of "medicalising childhood" by focussing on symptoms rather than causes, the government's mental health champion for schools has warned.
The chief inspector of schools has warned that good teachers are in short supply in the areas of greatest need, as he revealed details of growing failure in England's secondary schools, with tens of thousands more pupils attending schools condemned as inadequate.
Meanwhile, schools have warned of a looming teacher recruitment crisis as figures show chronic shortages of trainees in key subjects such as maths and foreign languages.
Critics of faith schools have warned that religious fanatics could try to take advantage of the new law and create schools that teach their beliefs.
Britain's leading expert on school recruitment has warned that a shortage of trainee teachers is reaching crisis levels in some of the most important subjects in the curriculum.
