问题补充：
no matter + 疑问词和疑问词-ever的用法有何不同?如no matter what和whatever
答案：
虽然“ no matter ＋疑问词”和“疑问词＋ ever ”都可以用来引导让步状语从句,但后者的用途更广,这类词（ whoever,whatever,whichever,whenever,wherever 等）还可用来引导主语从句、宾语从句、时间或地点状语从句等.
例如：Whoever comes to the party will receive a gift.
（主语从句）来参加晚会的人都会收到一份礼物.
比较：Whoever comes to the party,he will receive a gift.（让步状语从句）＝ No matter who comes to the party,he will receive a gift.
无论谁来参加晚会,都会收到一份礼物.
You can take whichever book you like best.（宾语从句）你可以拿走你喜欢的任何一本书.
Whenever we see him,we speak to him.（时间状语从句）每当我们见到他时,我们都跟他说话.
