My English is not very good.
I am working hard on my English .
My English is poor.
My English is not perfect!
I'm not accomplished in English.
以上都可以表示“我的英语不是很好”。
补充：
My English is not very good. If you don't understand me, I can get help from my co-workers. （我的英语不太好，如果您不明白，我可以请我的同事帮忙。）
My English is not very good, so I'm a little afraid to speak up.（我的英语不是很好，所以我有点不敢大声说话。）
Although I have been living abroad since I was a child, my English has been poor.（虽然我从小生活在国外，但是我英语一直都不好。）
I am not confident in my English class because my English is not very good.（我很不自信在的英语课上，因为我的英语不是很好。）
My mother is an English teacher, but my English is not good.（我的妈妈是英语老师，但是我的英语并不好。）
相关词组：
Good词组：
be good to对...很友好。例子Why can't she be good to her sister? （为什么她不能对她姐姐好点？）
be good at擅长于……，后接动词ing 。例子 This card might be good at some point. （这张牌在某些情况下可能很好。）
be good for有益于；对…有好处。例子Anyway, the news seems to be good for you. （无论如何，这个消息对你来说是个好事。）
be good with善于应付...的，对...有办法。例子He must be good with kids. （他必须跟孩子相处得好。）