You should read this book.
There are three reasons why I recommend it so strongly.
First, all Japanese including me have never learnt how to make the
...続きを読むstructure of English and practiced it as well.
Second, our writing and thinking ways are totally different from the ones of English: we put the conclusion at the last in order to appeal the impact. On the other hand, English is a language to put the points you want to appeal most strongly at first.
Finally, you can't avoid living without using English at businesses or education scenes.
I believe that you can improve you English structures in writing thorough practical trainings based on good materials like this book.
You should know the rules we should follow in writing English, which has never been taught to you in Japan actually. But in fact, almost all people having high skills on the job and being from other countries can use English easily.
Reading this book and then trying to write an essay in English can improve your writing skills.