很抱歉，请原谅我，我的英文的确不太好，怎么说？

很抱歉，请原谅我，我的英文的确不太好，跟你说话我不得不借助一些工具
I am sorry for my poor english, so please forgive me to talk with you with h ehelp of some tools

最好不要用poor来形容自己的英文水平..
I am sorry for my broken English.
这里用broken比较生动..而且老外听了也会就得你的英文根本不broken.~~

如果你所谓的“英语不好”只是词汇量不够的话，不要说自己英语不好，坦言有些词不认识，要用到词典高可以了

Sorry, I do not know some of the words in while we are chatting, so I have to use dictionary.

Very excuse me, beg your pardon I, my Englishs really not so good, talk with you I have to ask for help some tools

Sorry, please forgive me, my English in not so good.