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星期天我必须去学校。
I have to go to school on Sunday
下班以前,我必须完成这项任务。
Before off work, I must finish this mission
如果想要买这个东西就必须努力工作赚钱。
If you want to buy this thing you have to work hard to make money
十二月份以前,我必须通过汉语水平考试五级。
I must pass the HSK five test before December