Proofreading

1. articles => a /an/the/some/any/ singular or plural (subject or object)
2. subject verb agreement => I go/ He goes
3. Tenses => active / passive
4. conjunctions => and, but, or, when, since
5. Prepostions => in, on, at, through, past, along, by
6. Parts of speech => noun, pronoun, adjective, adverb, verb
7. spelling
8. choice of vocabulary (collocation)
9. phrasal verbs
10. modal verbs (shall, may, might, could, can, will, would, should)
11. gerund or infinitive (swimming, to swim)
12. sentence structure