1）though， although引導的讓步狀語從句，后面的從句不能有but，但是 though 和yet可連用。例如：

　　Although it's raining， they are still working in the field.　雖然在下雨，但他們仍在地里干活。

　　He is very old， but he still works very hard. 雖然他很老了，但仍然努力地工作。

　　Though the sore be healed， yet a scar may remain. 傷口雖愈合，但傷疤留下了。（諺語）

　　2）  as， though 引導的讓步從句必須表語或狀語提前（形容詞、副詞、分詞、實義動詞提前）。例如：

　　Child as /though he was， he knew what was the right thing to do. 雖然是個小孩，該做什么不做什么，他全知道。

　　3）  ever if， even though　即使。例如：

　　We'll make a trip even though the weather is bad. 即使天氣不好，我們也要去遠足。

　　4）  whether…or…　不管……都。例如：

　　Whether you believe it or not， it is true. 信不信由你，這確實是真的。

　　5）　"no matter +疑問詞" 或"疑問詞+后綴ever" .例如：

　　No matter what happened， he would not mind. =Whatever happened， he would not mind. 不管發生什么，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.

　�。▽Γ￤hatever you say is of no use now. 你現在說什么也沒用了。（Whatever you say是主語從句）

　�。ㄥe）Prisoners have to eat no matter what they're given，

　�。▽Γ㏄risoners have to eat whatever they're given.囚犯們只能給什么吃什么。