Examples
tā他gěi给zì jǐ自己dìng xià定下měi tiān每天zǎo shang早上sàn bù散步de的guī ju规矩。
他给自己定下每天早上散步的规矩。
He makes it a rule to take a walk every morning.
他们已经决定下个月结婚。
They've decided to get married next month.
我们必须快点定下旅游日期。
We have to fix the date for our trip quickly.