can i use comma before 'and' when connecting a dependent clause












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"The word is of Dutch origin, and is one of many Dutch words used to discuss barriers in the natural landscape."(https://m.wisegeek.com/what-is-a-berm.htm)
i learned that you shouldn't use a comma before 'and' when one of the clauses it’s connecting is a dependent clause. But "is one of many Dutch words used to discuss barriers in the natural landscape" is dependent clause ,so you shouldn't use comma before 'and' in my knowledge.
My question is :why does this writer use comma? is it grammarly right?










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    "The word is of Dutch origin, and is one of many Dutch words used to discuss barriers in the natural landscape."(https://m.wisegeek.com/what-is-a-berm.htm)
    i learned that you shouldn't use a comma before 'and' when one of the clauses it’s connecting is a dependent clause. But "is one of many Dutch words used to discuss barriers in the natural landscape" is dependent clause ,so you shouldn't use comma before 'and' in my knowledge.
    My question is :why does this writer use comma? is it grammarly right?










    share|improve this question







    New contributor




    jc xh is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























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      "The word is of Dutch origin, and is one of many Dutch words used to discuss barriers in the natural landscape."(https://m.wisegeek.com/what-is-a-berm.htm)
      i learned that you shouldn't use a comma before 'and' when one of the clauses it’s connecting is a dependent clause. But "is one of many Dutch words used to discuss barriers in the natural landscape" is dependent clause ,so you shouldn't use comma before 'and' in my knowledge.
      My question is :why does this writer use comma? is it grammarly right?










      share|improve this question







      New contributor




      jc xh is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      "The word is of Dutch origin, and is one of many Dutch words used to discuss barriers in the natural landscape."(https://m.wisegeek.com/what-is-a-berm.htm)
      i learned that you shouldn't use a comma before 'and' when one of the clauses it’s connecting is a dependent clause. But "is one of many Dutch words used to discuss barriers in the natural landscape" is dependent clause ,so you shouldn't use comma before 'and' in my knowledge.
      My question is :why does this writer use comma? is it grammarly right?







      punctuation






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      asked 45 mins ago









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