并列连词引导两个并列的句子。
1)and 与or
判断改错：
They sat down and talk about something.
They started to dance and sang.
I saw two men sitting behind and whisper1 there.
They sat down and talked about something.
They started to dance and sing.
I saw two men sitting behind and whispering2 there.
分析：
第一句： and 连接两个并列的谓语，所以 talk 应改为 talked。
第二句：and 连接两个并列的动词不定式，第二个不定式总是省略to，因此sang 应改为 sing。
第三句：and 连接感观动词saw 后面的用作的宾补的两个并列分词结构，因此whisper应改为whispering。
注意：and 还可以和祈使句或名词词组连用表示条件。（or也有此使用方法）
Make up your mind, and you'll get the chance.
= If you make up your mind, you'll get the chance.
One more effort, and you'll succeed.
= If you make one more effort, you'll succeed.
2)both and两者都
She plays the piano and the guitar.
3)not onlybut , as well as不但而且）
She plays not only the piano, but the guitar.
注意： not only but also 关联两个分句时，一个分句因有否定词not 而需要倒装。
Not only does he like reading stories, but also he can even write some.
4)neithenor 意思为既不也不谓语动词使用就近原则，与nor后的词维持一致。
Neither you nor he is to blame.
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