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Sentence Correction: Pronoun Questions - Overview and Grammatical Mistake

In 1430, Duke Philip the Good of Burgundy founded the Order of the Golden Fleece, demanding from the 24 knights nominated to join it uncompromising fealty, devotion to the glory of God, and to defend the Christian faith, if need be, by going on a crusade to the East.

Incorrect.

In this answer choice, the first and second items in the list are nouns (fealty, devotion), but the third item is an (unconjugated) verb (to defend).

In a list of 3 or more items, all the items should be in the same part of speech or of the same type of the part of speech (all nouns, or all verbs, or all adjectives...).

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Incorrect.

While this answer choice corrects the parallelism mistake in the original sentence by changing the verb to defend to the noun defense, by changing the pronoun it to him, this answer choice changes the meaning of the original sentence.

In the original sentence the pronoun it refers to the non-human Order of the Golden Fleece, while in the corrected sentence him can only refer to the human subject Duke Philip. The change in what the knights are being nominated to is considered a change in meaning.

Incorrect.

This answer choice is ungrammatical and stylistically flawed.

While this answer choice appears to correct the parallelism mistake in the original sentence by changing the first item in the list from a noun (uncompromising loyalty) to a verbal phrase (to be uncompromisingly loyal), the changes to the second and third items in the list (devotion-->to devote, to defend -->to defense) create stylistic and grammatical errors, and therefore do not truly correct the parallelism.

The change to the third item in the list is an outright grammatical mistake: the proper form of the verb is to defend. Defense is a noun.

In addition, the corrected sentence uses the wordy phrase to be uncompromisingly loyal, which makes the sentence even more stylistically awkward.

[[snippet]]

Well done!

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By changing the third item in the list from a verb (to defend) to a noun phrase (a commitment to defend), this answer choice corrects the parallelism mistake in the original sentence.

Although this answer choice is less concise than the original sentence, it is the only answer choice which is both grammatically correct and logical.

Incorrect.

This answer choice is grammatically incorrect. The first item in the list is a noun (fealty), whereas the second and third items in the list (devoting, defending) are verbal forms (V+ing).

[[snippet]]

Note that in this sentence, the word uncompromising is an adjective that describes the noun fealty, and does not serve as a verbal form (V+ing) as the other two items in the list do.

In addition, this answer choice changes the meaning of the original sentence.

In the original sentence the pronoun it refers to the non-human Order of the Golden Fleece, while in the corrected sentence him can only refer to the human subject Duke Philip. The change in what the knights are being nominated to is considered a change in meaning.

it uncompromising fealty, devotion to the glory of God, and to defend the Christian faith, if need be, by going on a crusade to the East
him uncompromising fealty, devotion to the glory of God, and defense of Christianity, if need be, by going on a crusade to the East
it to be uncompromisingly loyal, to devote themselves to the glory of God, and to defense the Christian faith, if need be, on an Eastern crusade
it uncompromising fealty, devotion to the glory of God, and a commitment to defend the Christian faith, if need be, by going on a crusade to the East
him uncompromising fealty, devoting themselves to the glory of God, and defending the Christian faith by going on a crusade to the East, if necessary