1. Grammatical error: This is the most common error, including subject-predicate inconsistency, tense confusion, incorrect use of part of speech, etc.

2. Spelling mistakes: This may affect the reader's understanding of the paper, so pay special attention.

3. Punctuation error: The wrong use of punctuation may lead to unclear or ambiguous sentences.

4. Improper vocabulary selection: Using inaccurate or overly complicated vocabulary may confuse readers.

5. Sentence structure confusion: If the structure of a sentence is too complicated, it may be difficult for readers to understand its meaning.

6. Unclear logic: If the logical structure of the paper is unclear, it may be difficult for readers to keep up with your ideas.

7. Citation error: If you cite other people's opinions or research in your paper, you need to make sure that your quotation is correct.

8. Format error: including font, font size, line spacing, margins, etc.

9. Misuse of technical terms: If you use a lot of technical terms in your paper, you need to pay attention to their correct usage.

10. Inconsistent language style: the language style of the whole paper should be consistent, and the language style should not be changed suddenly in the paper.