Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

In the sentence "Each learner of English ___ a good dictionary," the key to understanding which verb form to use lies in the subject "Each learner." The word "each" is a singular determiner that indicates that we are talking about individual learners, not the group as a whole. Consequently, we need to use a singular verb to match this singular subject.

The options provided include:

A) need - This is a plural form and does not agree with the singular subject.
B) is - While this is a singular verb, it does not fit in the context where a requirement (a good dictionary) is being expressed.
C) are - Similar to option A, this is a plural form and is incorrect as it does not align with the singular subject.
D) needs - This is the correct form because it is the singular third-person form of the verb “need,” which agrees with the singular subject "Each learner."

Therefore, the correct answer is D) needs, making the complete and grammatically correct sentence: "Each learner of English needs a good dictionary." This use of singular agreement is crucial in constructing clear and accurate English sentences.