英语语法状语从句第二课时
no matter +疑问词 或疑问词+后缀ever 。例如：
No matter what happened, he would not mind. =Whatever happened, he would not mind. 不管发生什么，他不在意。
替换：no matter what = whatever
no matter who = whoever
no matter when = whenever
no matter where = wherever
no matter which = whichever
no matter how = however
注意：no matter 不能引导主语从句和宾语从句。
(错)No matter what you say is of no use now.
(对)Whatever you say is of no use now. 你现在说什么也没用了。(Whatever you say是主语从句)
(错)Prisoners have to eat no matter what theyre given,
(对)Prisoners have to eat whatever theyre given.囚犯们只能给什么吃什么。
19.8 比较while, when, as
as, when 引导短暂性动作的动词。例如：
Just as / Just when / When I stopped my car, a man came up to me. 我一刹车，有一个人向我走来。
2)当从句的动作发生于主句动作之前，只能用when 引导这个从句，不可用as 或 while。例如：
When you have finished your work, you may have a rest. 赶完活后，你可以休息一下。
3)从句表示随时间推移连词能用as，不用when 或while。例如：