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However, when other clauses intervene between the subject and the verb, errors in subject-verb agreement become more common. Errors sometimes occur because word processing software does not correctly identify the subject and suggests an incorrect verb form, so be alert as you write any important documents!
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It would show that you didn't just read something from one source and believed it. When researching it is good to read around and see different results or if the information may be the close to what you gathered elswhere etc.
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When he found his keys, he let out a sigh of relief.
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