（一）連詞概述
連詞是連接單詞、短語或句子的一種虛詞。在句中不單獨(dú)作句子成分。歷年中考中?？疾⒘羞B詞and，but，neither… nor；從屬連詞now that，though，when。所以了解狀語從句和賓語從句的真正意義有助于正確使用從屬連詞。

（二）基礎(chǔ)知識梳理
1．并列連詞用來連接彼此并列的詞、短語或句子。并列連詞有and，or，but，so，for，nor等。

2．關(guān)聯(lián)連詞有both…and，either… or，neither…nor，not only…but also，as well as，as much as等。

3．連接性副詞有however，therefore，besides，yet，anyway，still，all the same等。

4．并列連詞和連接性副詞存在以下的區(qū)別：
1)連接兩個獨(dú)立的分句時(shí)，并列連詞的位置只能放在它所引導(dǎo)的分句的句首，前面通常有逗號。如：
I must work hard, for I still have a long way to go.
They all went, but I didn't go.
2)連接性副詞的位置比較靈活，句中、句首、句末都可以。但是放在句首較為普遍。如：
Mother was ill, therefore, she stayed at home yesterday.
= Mother was ill, she therefore, stayed at home yesterday.
= Mother was ill, she stayed at home yesterday, therefore.
3)兩個并列連詞不可以連用。如：
He tried hard．a(chǎn)nd but he failed to get the job.此句中的but應(yīng)改為yet。因?yàn)閍nd和but都是連詞。

5．從屬連詞是用來引導(dǎo)從句，如賓語從句、狀語從句、定語從句等。從屬連詞有that， if, unless, whether, who, whose, what, which, where, than, when, while, as, since, though, although, because, before, after, until, as soon as, now that, so...that, so that, as... as,(not) as/so…as 如：
If it snows tomorrow，we won't go on a picnic.（If引導(dǎo)條件狀語從句）
Could you tell me whose PC it is? （whose引導(dǎo)賓語從句）
The man who is talking to my class teacher is my father.（who引導(dǎo)定語從句）