kě yǐ
不会的事情，用心去学，是可以学会的
Bù huì de shìqing, yòngxīn qù xué, shì kěyǐ xuéhuì de.
Things you don't know how to do can be learned if you study them with dedication.
这片麦子已经熟了，可以割了。
zhè piàn màizi yǐjīng shú le, kěyǐ gē le.
This wheat field is already ripe and can be harvested.
你可以走了。
nǐ kěyǐ zǒu le.
You can go now.