The sentence that has no errors is "I took the Canal Zone and let Congress debate; and while the debate goes on, the canal does also".
Grammar and mechanics mistakes within sentences are known as sentence errors in Standard Written English. Related Concepts: awkward sentence structure, style, and writing styles. "Students make mistakes as they learn, and as they get more proficient at writing, they frequently produce new mistakes rather than fewer mistakes.
A sentence must have a singular or plural subject and verb in order to be grammatically valid. To put it another way, the tenses of the subject and verb must match. The verb should be in the plural form if the subject is plural (and vice versa).
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