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Sentence Correction: Subject Verb Agreement Questions - Overview

Lions, which are also called Panthera leo, is the second largest living cat, after the tiger.

Incorrect.

This answer choice is grammatically incorrect: the plural subject Lions does not agree with the singular verb is in the second part of the sentence (...is the second largest living cat...).

Incorrect.

This answer choice is grammatically incorrect: the plural subject Lions does not agree with the singular verb is.

Incorrect.

This answer choice is grammatically incorrect: the singular subject lion does not agree with the plural verb are.

Good job!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the plural constructions Lions....are to the singular constructions The lion...is, to match the second occurrence of the verb is, outside the underlined section (is the second largest...)

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake, it does not stop there and makes another change - omitting the word also. The result is a change of the original meaning.

Kudos for detecting the grammatical Subject Verb Agreement mistake and choosing an answer choice that corrects it. 

Did you notice the omission of the word also?

Did you think the omission of the word also was an advantage?

Did you read the fifth and last answer choice before choosing this one?

The lesson to be learned here is not to jump at the first answer choice that corrects the original mistake. Why not? Well, for two reasons:

1. There could be another  mistake in this answer choice. It might correct the original mistake but add a different mistake.

2. There could be other answer choices that also correct the original mistake , and you have to read all of them and analyze the differences between them in order to choose the best one.

In this case, you made an error in judgement. You were left with two answer choices but preferred the incorrect one. Better luck next time!

While generally, there is a stylistic preference for concise answer choices, it does not mean that the shorter an answer choice is always better. What can be omitted is only what is redundant in the first place, as long as this does not result in a loss of some of the original meaning.

The word also is not redundant. Omitting it does not preserve the original meaning but rather changes it.

Lions, which are also called Panthera
Lions, which is also called Panthera
The lion, which are also called Panthera
The lion, which is called Panthera
The lion, which is also called Panthera
Yes
No
Yes
Yes
No