But on the other hand, we continue to see huge sales of teacher-oriented textbooks that cover the waterfront of the major facts, laws, and theories in each and every domain of science.

Google Translation / DeepL Translation

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covers the waterfront

（ present singular third-person ）

covering the waterfront

（ participle present ）

covered the waterfront

（ participle past ）

covered the waterfront

（ past ）

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cover the waterfront

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cover the waterfront

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