麻烦解释下原因：_____ you are young,you must work hard.

麻烦解释下原因：_____ you are young,you must work hard. You must work hard you must ___ hard when you are doing a _____ You must be work hard 3.填空.1) You are _____ young _____ go.2) You work _____ at sc 一道反意疑问句You must work hard,_____ you?为什么不是mustn't When you are young,you have to work hard to make money. Even though you are clever,you must work hard.(同义句转换） _____ a student,you must study hard. 选择适当的形式填空 1.English is very helpful.You must work _____(hard when you are young,youhave to work hard to make money,是什么意思? Work hard,_____ you'll succed.