1. 一定要小心!

[ yī dìng yào xiǎo xīn ! ]

To be careful!

2. 只要你肯尝试，你一定能做这件事。

[ zhǐ yào nǐ kěn cháng shì ， nǐ yī dìng néng zuò zhè jiàn shì 。 ]

If you would only try, you could do it.

3. 只要你觉得某事值得去做，就一定要把它做好。

[ zhǐ yào nǐ jué dé mǒu shì zhí dé qù zuò ， jiù yī dìng yào bǎ tā zuò hǎo 。 ]

What is worth doing is worth doing well.