有关状语从句It will be 4 years before he can join the army.为什么只能用before?用that 或when It's 10 years ago +that?那么when呢?又是怎样使用?

有关状语从句It will be 4 years before he can join the army.为什么只能用before?用that 或when It's 10 years ago +that?那么when呢?又是怎样使用? You think it may be difficult.It will most likely turn out to be so.连成时间状语从句, it will not be long berfore we knowthe result before在这领导的是时间状语从句吗 有关状语从句-------it rains ,the game will be played on time.答案是Unless 为什么不可以是Though?_____I was twenty,I had never been away from my hometown.答案是Until,为什么不可以是Though? 条件状语从句 if 1.He’ll do better in English.He will work harder.2.Hurry up,or you will be late 33.We won't be able to get there at ten.We don't leave now4.Work hard,and you will pass the exam5.They will stay at home .It will rain tomorrow6.Y 以before或after引导的状语从句有问!进入帮手例：It will be four days before they come back哪句系主句?哪名是从句? It will be a fun place to go if the mall build.符合条件状语从句吗,从句有没有错? 怎么看出,状语从句是修饰主句的动词或副词或形容词?如这个句子,是个状语从句It will not be long before we meet again ,我就不知道他修饰的是什么 条件状语从句如何改为间接引语,能举例说明一下更好.it will be better if she does her own work. It will be four years ( ) he can join the army .什么状语从句啊?用什么呢before,since,when,that be quick or you will be late改为含有if引导的条件状语从句 If 条件状语从句7.We come tomorrow if you'll like.8.If you'll not careful,the knife cuts you.9.If it will be fine on Sunday,Mum will take me to the amusement park.10.If I'll swim every day this summer,I'll be very healthy.11.What do you buy if y be going to 和will在if引导的条件状语从句有什么区别? be going to和 will在if引导的条件状语从句中有什么区别 It will be the first time that 后为什么用现在完成时代替将来完成时是主将从现吗?这个不是定语从句吗?主将从现不是用于条件时间状语从句中吗? think it over,you will find the answer.改为条件状语从句 状语从句填空:Once your promise ____(make),you will keep it without regret. if your mother knows about it ,she will reprimand you改为时间状语从句