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

Australia is one of the countries that compete and often win the Olympic gold medal for swimming.

This answer choice is grammatically incorrect. The verb compete requires a preposition in order to logically connect to the Olympic gold medal for swimming.

Whenever the first verb requires a preposition after it and the second verb does not, the preposition must not be omitted:

Incorrect: John cares and loves Jane.
Correct: John cares for and loves Jane.

What helps us identify this question as a Split Construction question and identify the mistake is the following Stop Sign:

A split construction: Verb A + and/or + Verb B + object

Although this answer choice corrects the original Split Construction error by inserting the preposition for to logically connect compete to the Olympic gold medal, it is grammatically incorrect. The relative clause that...swimming describes the noun that appears immediately before it, namely, countries. Since countries is plural, the verb that follows it also needs to be plural. However, competes and wins are both 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 original Split Construction error by inserting the preposition for to logically connect compete to the Olympic gold medal, it is grammatically incorrect. The relative clause that...swimming describes the noun that appears immediately before it, namely, countries. Since countries is plural, the verb that follows it also needs to be plural. However, competes 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 original Split Construction error by inserting the preposition for to logically connect compete to the Olympic gold medal, it is not the most concise of the answer choices.

Great!

This answer choice corrects the original Split Construction error by inserting the preposition for to logically connect compete to the Olympic gold medal. It also matches the plural verbs compete and win, found in the Relative Clause, to the plural subject countries.

compete and often win
competes for and often wins
compete for and often are the winners of
competes for and quite often win
compete for and often win