The primary aim of teaching English grammar revolves around equipping learners with effective communication skills.

Grammar's Key Objective: Clear Expression

The major objective of teaching English grammar is to:

• develop the ability to express ideas logically and correctly in speech and writing.

This goal emphasizes clarity, structure, and accuracy in communication, ensuring that ideas are conveyed effectively whether spoken or written.

Why Other Options Are Secondary

• Increase ability to memorize rules: While memorizing rules is part of learning grammar, it's a means to an end, not the ultimate objective. The focus should be on applying the rules for effective communication.
• Develop interest in studies: Fostering interest is a general educational goal, applicable to all subjects, not the specific, primary objective of grammar instruction itself.
• Increase the originality of our ideas: Grammar provides the structure to express ideas, but the originality of ideas is a cognitive and creative skill. Correct grammar supports the expression of original ideas but doesn't directly increase their originality.

Therefore, the core purpose is mastering the logical and correct use of the language for expression.