并列连词（FANBOYS）： for, and, nor, but, or, yet, so
从属连词： because, although, when, if, while, since, unless
连接副词： however, therefore, moreover, nevertheless, consequently
注意： 不要混淆连接副词和连词的标点用法！
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并列连词、从属连词和连接副词的正确使用。
并列连词（FANBOYS）： for, and, nor, but, or, yet, so
从属连词： because, although, when, if, while, since, unless
连接副词： however, therefore, moreover, nevertheless, consequently
注意： 不要混淆连接副词和连词的标点用法！
Reading sentence insertion often tests transition words. Understand the logical relationship between sentences.