习惯表达方式:
I only know some English, so I don't understand what you're saying.
句子的意思是
“我只懂一些英语,所以我不明白你在说什么。”
My English is not very good!,So I can't understand what you say.
我的英语不是很好!所以我不理解你所说的。
I could not understand what you said,because I only knew a little English.