连词前面的逗号问题 while so that
①She is a girl，while I am a boy. ②She is a girl while I am a boy.并列连词 while前面可以不加逗号么？还有比如：① people have to spend a great number of time and energy on acquiring advanced skills and knowledge，so that they could retain a competitive edge in job market.② people have to spend a great number of time and energy on acquiring advanced skills and knowledge so that they could retain a competitive edge in job market.so that前面逗号可以省略么？
首先说while，在当连词使用时，如果表示两件事同时发生时，while前不加逗号；表示某一件事是在另一件发生过程中的发生的，while前面也不加逗号；表示但是、然而，while前要加逗号，如这里的she is a girl，while I am a boy写法正确。
再来说so that，以便、以致于，就我所知道的句子，so that前一般不加逗号，除非后面所接句子的主语不是人，Stand the table on its legs, so that the top is horizontal. 把这桌子立起来，使桌面成水平状。
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