關于英語句子中的標點符號
如例句：“If they did,they often were not taught much except the French language,how to sew clothing,and music.”
and music前面這個逗號可以省略嗎?說明理由.
還有“Through her lifelong work for education she became one of the most famous women in 19th century America.” she became 前需要逗號嗎？
She believed that women were teachers both in the home and in the classroom.both前需不需要逗號
And,she believed that efforts to better educate young women also served God.and 后的逗號可不可以省