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.

　　（對）Whatever 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）

　　（錯）Prisoners have to eat no matter what they're given，

　　（對）Prisoners have to eat whatever they're given.囚犯們只能給什么吃什么。