他说得很清楚
tā shuō de hěn qīngchǔ
He spoke clearly
声音不清楚
shēngyīn bù qīngchǔ
The sound is unclear
我不太清楚
wǒ bù tài qīngchǔ
I'm not very clear / I don't really know
你清楚吗？
nǐ qīngchǔ ma?
Are you clear/Do you understand?
