I "m sure you" re not foreigner. So why don "t you write in Chinese?"

我想你肯定不是老外，所以为啥子不用中文说呢？

youdao

Now, the reason why I skipped it is I'm not sure this is the best way to look at the question.

我之所以没讲是因为,我不能肯定这是考虑这个问题的最佳方式。

耶鲁公开课 - 心理学导论课程节选

so this is why I'm not, I'm not a hundred percent sure

所以我也不能确定，

关于宿舍制度 - SpeakingMax英语口语达人

I'm not really sure why that is.

我不知道为什么。

经济危机也能避开 - SpeakingMax英语口语达人

We're not there yet (and I'm not sure why we'd want to get there).

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I'm not sure why it should matter, but I always love a good "best of" list.

NPR: The Best Living Songwriters

Number one is a master cleanse, number two is a Ratatouille, which I'm not sure why.

NPR: 'iPhone' Tops Google Zeitgeist List