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Sentence Correction: Subject Verb Agreement - A Complex Subject/Long Distance between Subject and Verb

Learning how to monitor consumer trends take patience and time. 

Incorrect.

This answer choice is grammatically incorrect. The singular subject Learning does not agree with the plural verb take. Remember that a subject in the form of Verb+ing is a singular subject.

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Correct!

This answer choice correctly matches the singular verb takes with the singular subject Learning

This answer choice repeats the original mistake. The subject singular subject Learning does not agree with the plural verb take. Remember that a subject in the form of Verb+ing is a singular subject.

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Another problem in this answer choice is the addition of the word usually, which is both redundant and creates a slight change in original meaning

This answer choice is grammatically incorrect. To learn is still a singular subject which does not agree with the plural verb take. Remember that a subject in the form of To Verb is a singular subject.

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While this answer choice corrects the original Subject Verb Agreement Mistake and is grammatically correct, the addition of the word usually creates both redundancy and a slight change in the original meaning.

Learning how to monitor consumer trends take
Learning how to monitor consumer trends takes
Learning how to monitor consumer trends usually take
To learn how to monitor consumer trends take
Learning how to monitor consumer trends usually takes