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Sentence Correction: Subject Verb Agreement - A Pseudo-Plural Singular Subject

Politics are considered a dirty business.

While this answer choice corrects the original mistake, it also adds the word as after considered.

Did you notice the addition of as?

The lesson to be learned is that after eliminating the answer choices that repeat the original mistake, you must carefully read ALL the remaining answer choices and detect ALL the differences between them.

Do not jump at the first answer choice that corrects the original mistake.

Focus on B and D: Consider does not require any preposition after it. "I consider him a good friend" is grammatically correct, and more concise than "I consider him as / to be a good friend".

Thus, answer choice B, while grammatically correct, is inferior to answer choice D, because B commits an error of redundancy.

Is Politics a singular or plural subject?

Correct! And that's exactly the problem with this answer choice: the subject is singular and the verb  are is plural.

Although politics ends with an -s, which makes it look like a plural subject, it is actually a singular subject, just like crisis, thesis, news, physics, etc.

Therefore, there is a problem with this answer choice: the subject is singular and the verb  are is plural

Well done!

This answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb are to the singular verb is, to match the singular subject Politics.

Although politics ends with an -s, which makes it look like a plural subject, it is actually a singular subject, just like crisis, thesis, news, physics, etc.

are considered a
is considered as a
are considered as a
is considered a
are considered
Yes
No
Singular
Plural

I'm not sure