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Sentence Correction: Relative Clauses - Choosing the Correct Relative Pronoun

One should work for a company who one believes in.

This answer choice is grammatically incorrect. The relative pronoun who cannot begin a relative clause that modifies a non-human noun (company).  

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

who, which, that, whose, whom

While this answer choice corrects the original Relative Clause mistake by using that to modify a non-human noun (company), it is grammatically incorrect. The pronoun he can refer to human male nouns, but there's no such noun in the sentence.

The pronoun one agrees with itself only.

What helps us identify this question as a Pronoun question as well as identify the 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 Relative Clause mistake by using that to modify a non-human noun (company), it is grammatically incorrect. The pronoun they refers to one but does not agree with it as one is singular and they is plural.

The pronoun one agrees with itself only.

What helps us identify this question as a Pronoun question as well as identify the 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 Relative Clause mistake by using that to modify a non-human noun (company), it changes the meaning of the original sentence. To believe is not the same as to believe in. To believe means to accept that something is true whereas to believe in means to have trust in someone/something.

Great work!

This answer choice corrects the original Relative Clause mistake by using that to modify a non-human noun (company).

who one believes in
that he believes in
that one believes
that they believe in
that one believes in