English
1) Proverbs
2)Voice change
3)error rules
4)Articles
5)Preposition
6)One word substitution
7)Tense
8)Synonyms & antonyms
9)Phrasal verbs
10)Gender
11)singular plural
12)Suffix
13)Prefix
14)Correctly spilt
15)Error collection
16)Narration change
17)appropriate preposition
18)Degree
19)Idiom phrase