你能用中文交流嘛用英语说是：Can you say it in Chinese?
这个是对的 it是不可以省略的,一般不用speak 这个是说某种语言,比如speak English这样用的.
或者比较常用的应该是 How to say it in Chinese?（这个是指你能用汉语说当前的那个东西吗）
如果是想表述我不懂英语,你能说汉语吗这样就要用Do you speak Chinese?或者Can you speak Chinese?
'My English is not very good. Can we speak Chinese?'
大概句型是这样, 具体用词可以稍有变化, 下面这些都可以. 前面半句可以换成:
"I'm afraid my English is not very good" 这样的语气稍微更客气些
"I'm sorry my English is not very good" 为英语不好表示道歉, 也表示很客气.
后半句的别的说法:
Can we talk in Chinese?
Do you mind if we speak Chinese?
Do you mind if we talk in Chinese?
Can we use Chinese instead?
Do you mind if we use Chinese instead?
Will it be okay if we talk in Chinese?
类似等等
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