proofreading

1) articles => a/an/the/some/any/singular&plural

2) Subject verb agreement

3) Tenses => active/passive

4) conjunctions => and/but/or/when/since

5) prepositions => in/ on/at/through/past/along/by /from/to/ for/into/with/because of/ due to/

6) 8 parts of speech

7) spelling

8) choice of Vocabulary (collocation)
relevant/related ; ideal/idle;
9) phrasal verb

10) modal verbs => shall/may/might/could/can/should/would/will

11) sentence structure => subject + verb + object + adjunct

12) relative clause =>Tom who is the tallest in the class was sick yesterday; the place where you can find water is the Nile River