【語法小貼士】
1. no matter
what（who，which，when，etc.）與whatever（whoever，whichever，whenever，etc.）的區別：
當引導讓步狀語從句時，兩者相同，可以互換，但當引導名詞性從句（主語從句，賓語從句，表語從句和同位語從句）時則只能用whatever（whoever，whichever，whenever，etc）。如上面最後兩個例句可改為：
However pure the water looks,I do not want to drink it.
I want to marry the man I love,no matter who he may be.
下面句子不能用no matter結構（no matter不能引導名詞性從句）：
Whoever comes back first is supposed to win the prize.（主語從句）
I am ready to do whatever you want me to .（賓語從句）
例證： Whatever you did,I will accept.為讓步狀語從句.
I will accept whatever you did.為賓語從句.
2. as 引導讓步狀語從句的用法
引導讓步狀語從句時，as意為“雖然，儘管”，通常從句要倒裝，倒裝的方法是將從句的表語或狀語放在as之前，而用though引導讓步狀語從句時句字則不必倒裝（口語中也可倒裝）。
e.g. Heavily as it was raining outside,they started out very early.
Young as he is,he knows a lot=Though he is young 或Young though he is,he….
他雖然年輕，但懂得很多。（though 也有這種用法，可以替換as，但although沒有這種用法）
注意，名詞提句首時，不加冠詞：
e.g：teacher as he is,he likes Chinese very much(teacher 前不加a或the）。
though還可以用作副詞，放在句末。如：
It was hard work;; I enjoyed it,though=It was hard work,but I enjoyed it.那工作很苦，但是我喜歡幹。
3.用though/although,as 引導讓步狀語從句時，句中不能用but表示轉折語氣。
不能說：Though he looks weak,but he is healthy.
而要說：Though he looks weak,he is healthy.
或者說：He looks weak,but he is healthy.
我自己認為讓步就是存在一定條件下的說法.
4 . however 用作副詞，不可連接句子。但可置於第二句的句首、句末或句中。要特別注意 標點的使用。
eg: Alice is a good student．However,she has one shortcoming．愛麗絲是一個很好的學生，但她仍有缺點。
He has not arrived. He may,however,come later. The composition is all right. There is room for improvement,however.
⒌ 除以上提到的從句連詞外，表示讓步的介詞短語有despite,in spite of，後接名詞。
eg. Despite all these facts,we cannot ignore the advantages of learning through internet.
though和although引導讓步狀語從句時，不可以與but連用。漢語中用"雖然……但是……”，但英語中只用though，although或but即可。
although/though he is very old,he still works very hard.=（he is very old,he still works very hard）雖然他老了，但他仍然很努力地工作。
不可說：although/though he is very old,but he still works very hard。
though和although可以與yet連用。此處yet雖與but同義，但它不是連詞，而是副詞。
though l knew the fact，yet l didnt say anything。儘管我知道，但我什麼都沒說。
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