并列连词：and but or之类的就是并列连词.并列连词单词前后的两个单词可以互换.
从属连词：用来连接各种从句.until(till)、since 、by就是从属连词.
例句：
并列连词：Apple and banana are very delicious.
从属连词：I studied hard until 12 o'clock last night.
并列连词：and but or之类的就是并列连词.并列连词单词前后的两个单词可以互换.
从属连词：用来连接各种从句.until(till)、since 、by就是从属连词.
例句：
并列连词：Apple and banana are very delicious.
从属连词：I studied hard until 12 o'clock last night.