alert有警觉的，警惕的，注意的;思维敏捷的;活泼的;等意思，那么你知道alert的过去式是什么吗?今天一起来学习一下alert的过去式以及alert的用法和例句，希望对大家的学习有所帮助!
alert的过去式及其它时态
alert的过去式:alerted
alert的复数:alerts
alert过去分词:alerted
alert现在分词:alerting
alert第三人称单数:alerts
alert的用法和例句
1、One should not run about aimlessly during an alert.
空袭警报期间不可到处乱跑.
2、Sirens sounded an end to the red alert.
警报声宣告了红色预警的结束。
3、A monkey is very alert in its movements.
猴子的动作很敏捷.
4、They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击.
5、Don't alert the enemy.
不要惊动敌人.
6、Hearing this, I was instantly on the alert.
我一听这话, 当下就警惕起来.
7、I managed to walk around unchallenged for 10 minutes before an alert nurse spotted me.
我四处走动了10分钟，没有受到查问，之后一位警觉的护士发现了我。
8、A sparrow is very alert in its movements.
麻雀行动非常机灵.
9、They were quiet during the alert.
警戒期间他们保持安静.
10、If our environment cools, then messages from the skin alert the body's thermostat.
如果外在环境变冷，体表会将这一信息传递给身体的体温调节中枢。
