Sorry that is not what bitcointalk is about, it is not like a college where you can learn how to write and speak English, it is a discussion forum, and truly the language used for communicating in bitcointalk is English (except the local boards), and there are many native speakers of the language here, you can learn a little from how they write.

Needless to say that it isn't enough, and the better thing to do is to improve your English writing and speaking off the forum, there are websites you can take English courses for some months, you can also install Grammarly to assit you too, as well as many other tools out there to learn English properly. Bitcointalk is a bitcoin discussion forum, take it to be that.