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Sentence Correction: Dangling Modifiers - Overview

Using its tail, a wall can not only be scaled by a gecko with great speed but also it can regain its grip after slipping.

This sentence begins with a modifier: Using its tail. A modifier should be placed right next to the noun it describes. The only noun that this modifier can logically modify is gecko. The noun  gecko, however, is quite far from the modifier that describes it. Therefore, it seems like a wall is using its tail and not the gecko.

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

A modifier, characterized by all of the following:
1. Verb+ing or Verb in 3rd form
2. Separated from the rest of the sentence by a comma
3. Appears at the very beginning of the sentence

Whenever you see this Stop Sign, focus on the modifier: check whether the noun right after the modifier is indeed the noun that the modifier describes. If it isn't - you've found your mistake.

This answer choice repeats the original Dangling Modifier error. The sentence begins with a modifier: Using its tail. A modifier should be placed right next to the noun it describes. The only noun that this modifier can logically modify is gecko. The noun  gecko, however, is quite far from the modifier that describes it. Therefore, it seems like a wall is using its tail and not the gecko.

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

A modifier, characterized by all of the following:
1. Verb+ing or Verb in 3rd form
2. Separated from the rest of the sentence by a comma
3. Appears at the very beginning of the sentence

Whenever you see this Stop Sign, focus on the modifier: check whether the noun right after the modifier is indeed the noun that the modifier describes. If it isn't - you've found your mistake.

That is correct!

This answer choice corrects the Dangling Modifier by placing the noun (gecko) directly after the modifier that describes it (Using its tail). It also uses the structure not only...but also correctly.

Although this answer choice corrects the original Dangling Modifier error by placing the noun (gecko) directly after the modifier that describes it (Using its tail), it is grammatically incorrect. In the GMAT, but also must be complemented by not only

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

not only... but also...

Although this answer choice corrects the original Dangling Modifier error by placing the noun (gecko) directly after the modifier that describes it (Using its tail), it is grammatically incorrect. In the GMAT, not only must be complemented by but also

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

not only... but also...

wall can not only be scaled by a gecko with great speed but also it can
gecko can not only scale a wall with great speed but
gecko can scale a wall with great speed but also
wall can be scaled by a gecko with great speed and it can
gecko can not only scale a wall with great speed but also