warn的用法例句：

　　1. He spends his spare time visiting schools to warn pupils off drugs.

　　他用自己的業(yè)余時(shí)間訪(fǎng)問(wèn)學(xué)校，告誡小學(xué)生遠離毒品。

　　2. Signs across the entrances warn all visitors to stub out their cigarettes.

　　入口處的告示牌提醒游客們熄滅香煙。

　　3. Lawrence kept on butting me but the referee did not warn him.

　　勞倫斯不停地用頭撞我，但是裁判并沒(méi)有警告他。

　　4. I must warn you against raising your hopes.

　　我必須警告你不要期望過(guò)高。

　　5. Analysts warn us away from drawing any conclusions.

　　分析家勸告我們不要妄下結論。