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Sentence Correction: Pronoun Questions - Ambiguity

John does not want to play tennis with Jane's brother because he always wins

This answer choice is stylistically flawed. The pronoun he is ambiguous because it agrees with both John and Jane's brother.

What helps us identify this question as a Pronoun question as well as identify the ambiguity mistake is the following Stop Sign:

Every pronoun in the underlined part of the sentence or after it

While this answer choice corrects the original ambiguity mistake, it creates a Subject Verb Agreement mistake by replacing the singular verb wins with the plural win.

While this answer choice corrects the original ambiguity mistake, it changes the meaning of the original sentence by replacing the reason word because with the opposition word although.

Very good!

This answer choice corrects the original ambiguity mistake and does not create any other mistakes. Note that replacing the word want with wish and because with since does not change the meaning of the original sentence as want and wish have the same meaning, as do because and since.  

While this answer choice corrects the original ambiguity mistake, it is stylistically flawed. Replacing the single word because with the five-word phrase because of the fact that creates redundancy.

John does not want to play tennis with Jane's brother because he always wins
John does not want to play tennis with Jane's brother because Jane's brother always win
John does not want to play tennis with Jane's brother although Jane's brother always wins
John does not wish to play tennis with Jane's brother since Jane's brother always wins
John does not want to play tennis with Jane's brother because of the fact that Jane's brother always wins