Let's evaluate the sentences for correct comma usage:
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Although she could neither see nor hear Helen Keller, wrote prolifically.
- This sentence is incorrect because the introductory clause "Although she could neither see nor hear Helen Keller" lacks a proper subject for the main clause. A correct version might be something like: "Although she could neither see nor hear, Helen Keller wrote prolifically."
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The woman, who spoke so eloquently, was Helen Keller.
- This sentence is correct. The commas are correctly used to set off the non-essential clause "who spoke so eloquently," which adds additional information about "the woman."
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Helen Keller, did not let obstacles deter her from reaching her goals.
- This sentence is incorrect because there should not be a comma after "Helen Keller." It should read: "Helen Keller did not let obstacles deter her from reaching her goals."
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Helen Keller, prolific author and speaker, could neither see nor hear.
- This sentence is correct. The commas are used correctly to set off the non-essential appositive phrase "prolific author and speaker," which describes "Helen Keller."
In summary, the sentences with correct comma usage are:
- The woman, who spoke so eloquently, was Helen Keller.
- Helen Keller, prolific author and speaker, could neither see nor hear.