The exercises in Lambdin are difficult. There is an official "Answer Key" available (often sold separately or found in university archives). Attempting to translate the exercises without the key to check your work can lead to reinforcing bad habits.
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Lambdin is a challenging but rewarding textbook. Good luck with your Hebrew studies! The exercises in Lambdin are difficult
If you want to save money: (the content is the same). If you absolutely need a digital version, consider scanning a library copy for personal use (fair use for study) rather than downloading a pirated PDF from a shady site. It’s natural to look for a PDF download
Finding Thomas O. Lambdin’s Introduction to Biblical Hebrew : Print, PDF, and Legal Options