粘连句就是指用逗号连接数个独立的分句。
例：An old woman lived in the house, she surprised Hansel and Gretel they were eating parts of
her home. (错)
该句中有3个主语(old woman, she, they)，三个动词(lived, surprised,和were eating)，分句可以用句号，
分号(而不是逗号)或使用连接词。最普通的连接词是: and, but, so和or。连接代词有who, which,和that，还有表
示时间连接词: before, after, when和so on。
上句可以改为：
①An old woman lived in the house. She surprised Hansel and Gretel. They were eating parts of her
home.
②An old woman lived in the house and she surprised Hansel and Gretel and they were eating parts of her house.
③The old woman who lived in the house surprised Hansel and Gretel while they were eating parts of her house.

While和who就使句子的逻辑比②句就清楚明白得多了。

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