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For more comprehensive worksheets, you can download these common grammar guides: British Council - Substitution and Ellipsis (PDF) Cambridge English - Advanced Grammar Exercises
In a digital age, why focus on PDFs? Because PDFs offer unique affordances for grammar training:
Using auxiliary verbs (do, does, did) for substitution.
When you search for you are looking for a resource that saves time and provides systematic practice.
She could have left earlier, but she didn’t leave earlier. → _________________________________________