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1. Use proper punctuation. 
2. A complete sentence always has a subject and a verb. 
3. Consider subject-verb agreement. Singular subjects must have singular form of verbs, e.g. April sings. Plural subjects must have plural form of verbs, e.g. the children sing.
4. Use appropriate tense of the verb. 
5. Avoid double negatives. 
6. Use conjunctions to connect ideas. 
7. Use the active voice as much as possible.