"It's spontaneous thoughtfulness that really touches the heart, that sympathetic connection that makes you feel cherished."

VOA: standard.2010.02.13

And our third example touches on not when you are expressing a level of certainty,

接下来的第三个例句并不是用于表示某种程度的肯定，

I'm sure 课堂 - SpeakingMax英语口语达人