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Sentence Correction: Relative Clauses - Choosing the Correct Relative Pronoun

Backgammon, which has its roots in ancient Mesopotamia, have become a popular game played on the internet by people from around the world.

While this answer choice corrects the original Subject Verb Agreement error by matching the singular verb has to the singular subject Backgammon, it is grammatically incorrect. The relative pronoun that cannot follow a comma. That can only begin defining (also called restrictive) relative clauses. Backgammon is already defined, so the relative clause that modifies it must be non-defining. Non-defining relative clauses should be separated from the rest of the sentence by a comma. As written above, the pronoun that cannot follow a comma.

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

This answer choice is grammatically incorrect. The singular subject Backgammon does not agree with the plural verb have.

What helps us identify this question as a Subject Verb Agreement question as well as identify the mistake is the following Stop Sign:

A long complex subject / a long distance between the subject and the verb

This answer choice is grammatically incorrect and repeats the original Subject Verb Agreement. The singular subject Backgammon does not agree with the plural verb are.

What helps us identify this question as a Subject Verb Agreement question as well as identify the mistake is the following Stop Sign:

A long complex subject / a long distance between the subject and the verb

While this answer choice corrects the original Subject Verb Agreement error by matching the singular verb has to the singular subject Backgammon, it is grammatically incorrect. The relative pronoun who can describe humans only while Backgammon is non-human

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

Well done!

This answer choice corrects the original Subject Verb Agreement error by matching the singular verb has to the singular subject Backgammon.

which has its roots in ancient Mesopotamia, have become a popular game played on the internet by people from around
that has its roots in ancient Mesopotamia, has become a popular game played on the internet by people all over
which has its roots in ancient Mesopotamia, has become a popular game played on the internet by people all over
which has its roots in ancient Mesopotamia, are a popular game played on the internet by people from around
who has its roots in ancient Mesopotamia, has become a popular game played on the internet by people from around