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Sentence Correction: Subject Verb Agreement Questions - Overview

What is the subject of the following sentence?

So far, all efforts to relieve world hunger have failed.

Good!

In 95% of the cases, the subject is what comes before the first verb EXCEPT what's separated from it by a comma. The comma separates So far from the rest of the sentence, telling us that it's not an integral part of the sentence.

While all efforts is part of the subject, it's not all of it.

In 95% of the cases, and this sentence is one of them, the subject is everything that comes before the first verb EXCEPT what's separated from it by a comma. The comma separates So far from the rest of the sentence, telling us that it's not an integral part of the sentence.

While world hunger is part of the subject, it's not all of it.

In 95% of the cases, and this sentence is one of them, the subject is everything that comes before the first verb EXCEPT what's separated from it by a comma. The comma separates So far from the rest of the sentence, telling us that it's not an integral part of the sentence.

So far
all efforts
world hunger
all efforts to relieve world hunger