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Sentence Correction: Relative Clauses - One of the + plural noun + who/which/that

Running is one of the activities that greatly increase cardiovascular performance but should be performed regularly as it will have a higher impact on levels of stamina.

This answer choice is grammatically incorrect. A pronoun (in this case, it) refers to a previously mentioned noun. If we wish to refer to a previously mentioned verb (be performed regularly), we need to use the phrase doing so or to do so.

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

Any pronoun in the underlined part or after it.

Very well done!

This answer choice corrects the original Pronoun error by replacing it with doing so to refer to the verb (be performed regularly).

This answer choice is grammatically incorrect and repeats the original Pronoun error. A pronoun (in this case, it) refers to a previously mentioned noun. If we wish to refer to a previously mentioned verb (be performed regularly), we need to use the phrase to do so or doing so.

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

Any pronoun in the underlined part or after it.

Although this answer choice corrects the Pronoun error in the original sentence by changing the pronoun it to doing so to refer to a verb (be performed regularly), it is grammatically incorrect. The relative clause that greatly increase cardiovascular performance describes the noun that appears immediately before it, namely, activities. Since activities is plural, the verb that follows it also needs to be plural. However, increases is singular.

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

one of the + plural noun + who/which/that

Whenever you see this Stop Sign, make sure that the following verb is plural.

Although this answer choice corrects the Pronoun error in the original sentence by changing the pronoun it to doing so to refer to a verb (be performed regularly), it is grammatically incorrect. The relative clause that greatly increase cardiovascular performance describes the noun that appears immediately before it, namely, activities. Since activities is plural, the verb that follows it also needs to be plural. However, increases is singular.

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

one of the + plural noun + who/which/that

Whenever you see this Stop Sign, make sure that the following verb is plural.

increase cardiovascular performance but should be performed regularly as it will have a higher impact on levels of stamina
increase cardiovascular performance but should be performed regularly as it will make a greater impact on stamina level
increase cardiovascular performance although it should be performed regularly as doing so will have a higher impact on stamina levels
increases cardiovascular performance but should be performed regularly as doing so will have a higher impact on levels of stamina
increases the cardiovascular performance but should be performed regularly as doing so will have a higher impact on stamina levels