老师告诫我们要认真学习。
lǎoshī gàojiè wǒmen yào rènzhēn xuéxí 。
The teacher warns us to study seriously.
他告诫我不要和坏朋友交往。
tā gàojiè wǒ búyào hé huài péngyǒu jiāowǎng 。
He admonished me not to associate with bad friends.
我妈妈常常告诫我注意安全。
wǒ māmā chángcháng gàojiè wǒ zhùyì ānquán 。
My mother often warns me to pay attention to safety.