不用说英语，我懂中文！翻译！！！！！

主语不一致要and连接
Don't speak English,and I know Chinese.

No need to speak English. I understand Chinese.

如果要礼貌一点，可以说
You don't have to speak English. I understand Chinese.

Don‘t speak English,I understand Chinese!

No need to speak English. I know Chinese.

Don't speak English, I know Chinese.

No English, I understand Chinese! Translate!!!!!