现在问题已经很清楚，我们可以开始解决了。

Xiànzài wèntí yǐjīng hěn qīngchu, wǒmen kěyǐ kāishǐ jiějué le.

Now the problem is already very clear, and we can start solving it.

他说得很清楚，我完全明白了。

Tā shuō de hěn qīngchu, wǒ wánquán míngbai le.

He spoke very clearly, and I completely understood.

请把你的想法说清楚一点。

Qǐng bǎ nǐ de xiǎngfǎ shuō qīngchu yìdiǎn.

Please explain your idea a bit more clearly.