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Sentence Correction: Subject Verb Agreement - X of Y Subject

The Haka war dance is one of the traditions that has been preserved by the Maori people until today, probably because the players of New Zealand's rugby team perform it before every international game.

This answer choice is grammatically incorrect. The relative clause that has been preserved by the Maori people until today describes the noun that appears immediately before it, namely, traditions. Since traditions follows the words one of the and is plural, the verb that follows it also needs to be plural. However, has 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 Relative Clause error by using the plural verb have, it is grammatically incorrect.

The phrase players of New Zealand's rugby team is an X of Y subject. In such cases, the verb should agree with X (players), which is plural. However, the verb performs is singular

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

The subject is in the form of X of Y

Although this answer choice corrects the original Relative Clause error by using the plural verb have, it is grammatically incorrect.

The phrase team of New Zealand's rugby players is an X of Y subject. In such cases, the verb should agree with X (team), which is singular. However, the verb perform is plural

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

The subject is in the form of X of Y

Although this answer choice corrects the original Relative Clause error by using the plural verb have, it is grammatically incorrect.

The phrase New Zealand team of rugby players is an X of Y subject. In such cases, the verb should agree with X (team), which is singular. However, the verb perform is plural

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

The subject is in the form of X of Y

Fantastic!

The relative clause that has been preserved by the Maori people until today describes the noun that appears immediately before it, namely, traditions. This answer choice corrects the original Relative Clause error by using the plural verb have.

has been preserved by the Maori people until today, probably because the players of New Zealand's rugby team perform it before every international game
have been preserved by the Maori people until today, probably because the players of New Zealand's rugby team performs it before every international game
have been preserved by the Maori people until today, probably because before every international game, the dance is performed by the New Zealand rugby team
have been preserved by the Maori people until today, probably because before every international game, the team of New Zealand's rugby players perform it
have been preserved by the Maori people until today, probably because before every international game, the New Zealand team of rugby players perform it