Sentence Correction: Comparatives - Like/Unlike

Jupiter and Saturn, unlike the terrestrial planets do, do not have an actual surface, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core.

Incorrect.

This answer choice is grammatically incorrect. The unlike section should not include a conjugated verb. In this answer choice, however, the unlike section includes a conjugated verb (unlike the terrestrial planets do).

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Incorrect.

Although this answer choice corrects the original Comparative error by removing the verb from the unlike section, it creates a Pronoun error. > The **pronoun** *they* in the phrase *but instead they consist* is meant to refer to *Jupiter and Saturn*. However, later on in the sentence there is the phrase *the closer they are to the core*. This *they* is meant to refer not to the planets but to *clouds of hydrogen compounds*. Since a single pronoun cannot refer to two different nouns in the same sentence, this usage is incorrect.

Incorrect.

This answer choice is grammatically incorrect and repeats the original Comparative error. The unlike section should not include a conjugated verb. In this answer choice, however, the unlike section includes a conjugated verb (unlike the terrestrial planets do).

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Incorrect.

Although this answer choice corrects the original Comparative error by removing the verb from the unlike section, it creates a Modifier error. > The **Verb+ing modifying phrase** *consisting of clouds of hydrogen compounds...* is **misplaced** because its placement following *unlike the terrestrial planets* makes it seem as if the modifier could be referring either to *Jupiter and Saturn* or to *the terrestrial planets*. There is a much better construction that does not create this same **ambiguity**.

Bravo!

This answer choice corrects the original Comparative error by removing the verb (do)  from the unlike section of a Comparative sentence.

Jupiter and Saturn, unlike the terrestrial planets do, do not have an actual surface, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core

Jupiter and Saturn do not have an actual surface, unlike the terrestrial planets do, but instead consist of clouds of hydrogen compounds that increase in density the closer they are to the core

Jupiter and Saturn, unlike the terrestrial planets, consisting of clouds of hydrogen compounds that increase in density the closer they are to the core, do not have an actual surface

Consisting of clouds of hydrogen compounds that increase in density the closer they are to the core, Jupiter and Saturn, unlike the terrestrial planets, do not have an actual surface

Unlike the terrestrial planets, Jupiter and Saturn do not have an actual surface, but instead they consist of clouds of hydrogen compounds that increase in density the closer they are to the core

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