在日常生活中，我們常常需要提醒他人注意某些事情，這時就可以使用“warn sb to do sth”這一結構來表達警告或提醒的意義。以下是一些實用的例句，幫助大家更好地掌握這個語法點：

1. 父母經常告誡孩子不要玩火。

- Parents often warn their children not to play with fire.

2. 老師提醒學生們考試前要復習好功課。

- The teacher warns the students to review their lessons before the exam.

3. 請記得提醒他按時提交報告。

- Please remember to warn him to submit the report on time.

4. 在河邊玩耍時，我們要小心別掉進水里。

- When playing by the river, we should be careful not to fall into the water.

5. 出門前，媽媽總是叮囑我帶傘以防下雨。

- Before going out, my mother always warns me to take an umbrella in case it rains.

通過以上句子可以看出，“warn sb to do sth”的用法非常靈活，適用于多種場景。希望大家能夠多加練習，逐漸熟悉并運用到自己的實際交流中去。