What is the author trying to say, explain or convince you of?

Two, the evidence for that claim? What are the facts, details, or other pieces of information that tell us that that claim is true or accurate? And three, the reasoning.

until I give you a reason to trust me. Who am I, after all?

Just some stranger on the internet. Well, that's a little unfair, actually.

You probably knew about Khan Academy well before you watched this video,

which means you have a sense that the information we teach is reputable or trustworthy.

1. 为什么多了一个多余的that？

2. have a sense引导的是同位语从句吗？