连词：把单词、短语、句子给连到一起的词。
常见连词：and、or、because、so、although、if、when、as、but、where
【并列连词】连接两个并列关系的词、短语或句子的连词。将词与词、词组与词组或句子与句子连接起来的词。
e.g.:You and me, from on world, we are family.
1、联合关系：and和
They are beautiful and smart.
I got up at 6:30 and cooked breakfast for my family.我六点半起床并为我的家人做了早餐。
and注意事项：在一句句子中同时有三个或三个以上并列的形容词，则最后两个形容词之间要用and连接。
e.g.:He is handsome, rich and tall.
2、转折关系：but但是
He wants to buy an iphone, but it's too expensive.他想买一个ipone,但是它太贵了。
I can't help you , but your parents can.我不能帮助你，但是你的父母可以。
He asked his parents to bye an iphone for him, but they refused.他要他的父母为他买一个iPhone，但是他们拒绝了。
【although（虽然，尽管）和but无法连用】----就是不能同时存在，通常情况下，although放在句首，but放在句中。Although iphones are very expensive, but he still wants to bye one.×
Iphones are very expensive, but he still wants to bye one.√
Although iphones are very expensive, he still wants bu buy one.√
3、选择关系：or或者
coffee or tea?咖啡或茶？
what do you want to eat,chincken or beef?你想吃什么？鸡肉或牛肉
They can take a taxi or the hotel shuttle bus.他们可以乘一辆出租车或者酒店班车。
4、因果关系：so所以
He really likes the food there, so he eats a lot.
【because（因为，后面跟原因）和so（所以，后面跟结果）无法连用】
Because he failed his exam, his parents were very angry.
He failed his exam, so his parents were very hungry.
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