no matter +疑問詞 或疑問詞+字尾ever 。例如：
No matter what happened, he would not mind. =Whatever happened, he would not mind. 不管發生什麼，他不在意。
替換：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 不能引導主語從句和賓語從句。
(錯)No matter what you say is of no use now.
(對)Whatever you say is of no use now. 你現在說什麼也沒用了。(Whatever you say是主語從句)
(錯)Prisoners have to eat no matter what theyre given,
(對)Prisoners have to eat whatever theyre given.囚犯們只能給什麼吃什麼。
19.8 比較while, when, as
as, when 引導短暫性動作的.動詞。例如：
Just as / Just when / When I stopped my car, a man came up to me. 我一剎車，有一個人向我走來。
2)當從句的動作發生於主句動作之前，只能用when 引導這個從句，不可用as 或 while。例如：
When you have finished your work, you may have a rest. 趕完活後，你可以休息一下。
3)從句表示隨時間推移連詞能用as，不用when 或while。例如：
