- Remove most adjectives and adverbs (choose stronger nouns and verbs).
- Shorten most sentences to one subject and one verb.
- Use active not passive voice nearly always. ("He did it" not "It was done.")
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2 bonus tips for pronouns:
- Keep subject and object forms of pronouns straight: I/me, he/him, etc
- Review rules for placing pronouns in relation to antecedents so readers know what you are referring to.