1. 你肯定吗?

[ nǐ kěn dìng ma ? ]

Are you sure?

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.