有问题可以告诉老师。

Yǒu wèntí kěyǐ gàosu lǎoshī.

If you have a problem, you can tell the teacher.

回家以后，他把今天的事告诉了妈妈。

Huíjiā yǐhòu, tā bǎ jīntiān de shì gàosu le māma.

After going home, he told his mom about what happened today.

请你告诉我怎么去火车站。

Qǐng nǐ gàosu wǒ zěnme qù huǒchēzhàn.

Please tell me how to get to the train station.