If you're unsure about that, check out, of course, chapter three in the textbook, where these issues are addressed.

当然,如果还不确定,可以看看课本的第三章,这些问题都提到了

耶鲁公开课 - 聆听音乐课程节选

I like to have something that's my own, and continue writing too. I really, I'm not sure.

我想有点自己的东西，还想继续写作。我真的不确定。

为我的生活 - SpeakingMax英语口语达人

The other thing I wanted to mention and I'm not sure if the exhibit's still there.

另外一个我想要指出的事情就是,我不确定它是不是还在展出。

麻省理工公开课 - 化学原理课程节选