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Sentence Correction: Comparatives - Superlatives

The Poison Dart Frog and the Inland Taipan are the most poisonous animals, both easily capable of killing humans and other large mammals.

Although this answer choice corrects the original Comparative error by defining the group under comparison (on earth), it is grammatically incorrect. The plural subject the Poison Dart Frog and the Inland Taipan does not agree with the singular verb is

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

The verb precedes the subject  

This answer choice is grammatically incorrect and repeats the original misuse of the Superlative form indicated here by the use of the word most. The Superlative form requires that the group under comparison be defined. However, this answer choice does not provide information about the group of which the the two animals are the most poisonous.

In order for this Superlative to be complete, this group must be defined.

This answer choice is grammatically incorrect as it misuses the Superlative form indicated here by the use of the word most. The Superlative form requires that the group under comparison be defined. However, this answer choice does not provide information about the group of which the the two animals are the most poisonous.

In order for this Superlative to be complete, this group must be defined.

This answer choice is grammatically incorrect because of the misuse of the Superlative form indicated here by the use of the word most. Most must be preceded by the word the. In this sentence, most poisonous is preceded by both.

Well done!

This answer choice corrects the original Comparative error by defining the group under comparison (earth).

Poison Dart Frog and the Inland Taipan are the most poisonous animals, both easily capable of
two most poisonous animals, the Poison Dart Frog and the Inland Taipan, are both capable of easily
most poisonous animals on earth, the Poison Dart Frog and the Inland Taipan is easily capable of
most poisonous animals on earth, the Poison Dart Frog and the Inland Taipan are both easily capable of
Poison Dart Frog and the Inland Taipan are both most poisonous animals in the world, easily capable of