Mark Lester Books

Advanced English grammar for ESL learners
Advanced English grammar for ESL learners

By Mark Lester

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"To fully understand how to speak English effectively you must move beyond the fundamental principles of grammar and tackle more sophisticated sentence constructions. Practice Makes Perfect: Advanc...

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English grammar drills
English grammar drills

By Mark Lester

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"Confident use of grammar is an essential foundation for learning English. English Grammar Drills will help you lay this foundation through clear explanations and rigorous practice. Your language s...

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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