以..给...一个警告

be an example to be an enemy to be an injury to be open to an offer make an example of take an example be under an obligation to sb. make an example of sb. hold up as an example let an opportunity slip Let it be. house to be let let be not to be taken as an evidence make an example of sb to let be able to breed an entirely new variety be at an utter loss what to do let bygones be bygones