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

（二）基礎(chǔ)知識(shí)梳理
1．并列連詞用來連接彼此并列的詞、短語(yǔ)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(gè)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(hào)。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(gè)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(yǔ)從句、狀語(yǔ)從句、定語(yǔ)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(yǔ)從句）
Could you tell me whose PC it is? （whose引導(dǎo)賓語(yǔ)從句）
The man who is talking to my class teacher is my father.（who引導(dǎo)定語(yǔ)從句）