Question

1) Where to use have & has & its rules and exceptions?
2) How to develop public speaking skills?
3) How to improve English grammar?

Answer 1

we use have for I we a d plural

and use has for he she it and singular
and dude you can develope your speaking only when you start thinking in English first you try to think in English then it will help you to speak fearlessly before other people
and to improve your grammer you should know all the tense and learn the tense chart it will help you