句型转换,用if改为同义句.1、call a taix,and you'll catch the train.------miss  the  train.2、she  can't  finish  the  hard  work  on  time  without  your  help  .she  can't  finish  the  land  hard  work  on   time    -------you   -----help.3、work hard,and  you will  pass  this   exam  .------you  work  hard,you  won't  ------to  pass  this  exam.4、hurry  up, or  you'll  be  late.---you  hurry up,you-----be  late.----you  don't  hurry  up,you---be  late.

--->1、Call a taxi, or you'll miss the train.
--->2、She can't finish the hard work on time if you don't help。
--->3、you won't be able to pass this exam unless you work hard.
--->4、If you hurry up，you won't be late.
If you don't hurry up，you will be late .
备注：考核点是状语从句，如有疑问，再联系我吧。祝学习顺利

1、call a taix,and you'll catch the train.
Call a taxi, or you'll miss the train.
2、she can't finish the hard work on time without your help .
She can't finish the land hard work on time if you don't help.
3、work hard,and you will pass this exam .
Unless you work hard,you won't be able to pass this exam.
4、hurry up, or you'll be late.
If you hurry up,you won't be late.
If you don't hurry up,you will be late