Improving My Writing Level

In this level I want to get the ability to can write a paragraph without mistakes and explain the things clearly, my writing problem is that I don’t know a lot of words and that frustrates me. My expectations for this level are take the able to learn new words and use that in my writings. Another important thing is learn verbs in differents times and write them in right time when I write a paragraph, because usually when I learn new words and I don’t use them again, I forget the meaning. I just want to improve my grammar and lose the fear of being wrong.