1. I can't express myself well in English. 我不能用英语很好的表达自己。 2. I have forgotten everything I learned. 学过的东西我全忘了。（现在完成时标准句） 3. I can't hold on without somebody's assistance. 没有人帮忙，我就坚持不住了。 4. I am working on it. Someday, it'll be a piece of cake. 我正在致力于它,有一天它会是小菜一碟。 5. I try to improve my English by chatting online. 我正通过网上聊天来提高我的英语。