In academic writing, some common grammar mistakes to avoid include:

1. Subject-Verb Agreement Errors: Ensure that the subject and verb agree in number.
2. Sentence Fragments: Complete all sentences with a subject and a verb.
3. Run-on Sentences: Use proper punctuation to separate independent clauses.
4. Misplaced or Dangling Modifiers: Ensure modifiers are placed correctly to avoid confusion.
5. Pronoun-Antecedent Agreement: Match pronouns with their antecedents in number, gender, and person.
6. Comma Splices: Avoid joining two independent clauses with only a comma; use a conjunction or appropriate punctuation.
7. Apostrophe Misuse: Use apostrophes correctly for possessives and contractions.
8. Word Choice Errors: Choose words carefully to convey the intended meaning accurately.
9. Lack of Parallelism: Maintain parallel structure in lists, comparisons, and constructions.
10. Verb Tense Consistency: Maintain consistency in verb tense throughout the text, especially within the same paragraph or section.