We must take care that no one sees us. 我们必须注意别让人看见我们。

　　Make sure you come back soon. 你要保证快点回来。

　　Be careful that you don’t hurt her feelings. 当心别伤了她的感情。

　　Watch that the baby doesn’t go near the heater. 注意别让宝宝接近加热器。

　　Mind you read the examination questions carefully before you begin to answer them. 在答题前要注意仔细阅读考题。