-you should start watching movies in english with a subtitle of your language
-talk to english friends or make english friends
-try to talk in english all the time
-read english books
-go to the internet and learn vocabulary and grammar
-learn to use a english dictionary
-use index cards write a word in english and on the other side write the word in your language and practice with yourself
-hire an english tutor
-ask a friend to teach you english if she/he knows
and there are many more ways to learn english, but here are a few :D
I used to have a teacher who said this as well. The best way to understand would be to show examples of how to specify such terms as “stuff” and “things”. For instance: “The birds have lots of stuff.” That was not clear because the reader does not know what the “stuff” is. Instead, the text could be changed to: “The birds have lots of feathers.” Now the reader knows what the stuff is because it has been replaced with a more specific word. If you go over multiple examples in your head, it will become easier to comprehend and you will get used to doing it.
When I think of persuasive I think of someone convincing another person to do something.