我是中國人, 講國語當然不會有問題啦 ~ translate to English

我是中國人, 講國語當然不會有問題啦
1. Hey, I am Chinese. Of course I can speak Putonghua !!
2. Being a Chinese I of course can speak Putonghua without any problem.
3. As a Chinese, speaking Putonghua is of course no problem.

I am a Chinese, no doubt I can speak fluent Putonghua!=]

以下為意譯, 希望能幫上忙!
I, being Chinese, can speak Mandarin/Putonghua, as a matter of course .

I am Chinese. It sure no problem if speaking in Putonghua / Mandarin.