1. Subject-predicate agreement: the subject and predicate must agree in person and number. For example, singular subjects should use singular predicates and plural subjects should use plural predicates.
2. Temporal consistency: In the same paper, we should keep the temporal consistency. For example, if you use the present tense throughout, you should avoid using the past tense or future tense.
3. Misuse of parts of speech: When using nouns, verbs, adjectives and other parts of speech, make sure their usage is correct. For example, don't treat nouns as verbs and adjectives as adverbs.
4. Article error: When using the article (a, an, the), pay attention to its usage. For example, don't use articles before uncountable nouns and plural nouns.
5. Misuse of pronouns: When using pronouns (he, she, it, them), we should pay attention to the target. For example, don't use pronouns to refer to unclear objects, and don't use the same pronoun repeatedly.
6. Misuse of conjunctions: When using conjunctions (and, but, or), pay attention to the connected objects. For example, don't connect two juxtaposed sentences with conjunctions, and don't connect two clauses with conjunctions.
7. Misuse of prepositions: When using prepositions (in, on, at), pay attention to their usage. For example, don't confuse prepositions with verbs or adjectives.
8. Sentence structure confusion: In order to avoid sentence structure confusion, different sentence structures such as simple sentences, complex sentences and complex sentences can be used to express complex meanings.