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Tense Bugs

The Most-Shipped Bug: Wrong Verb Tense

Tense Triage

Agreement Bugs

Subject-Verb Agreement, and Where It Breaks

Agreement Check

Article Bugs

A, An, The, or Nothing at All

Worked Debug: Tense, Agreement & Articles Together

Final Mixed Check

The three highest-frequency grammar bugs — wrong tense, subject-verb agreement, and article misuse — each classified, diffed, and drilled.

Three bugs cause more crashes than everything else combined: the wrong verb tense, a
subject and verb that disagree, and a missing or wrong article. Patch these three and
your error rate drops fast.

Grammar Bugs — Tense, Agreement & Articles

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