I could tell you everything about every day after that.

从那以后，每天发生的所有事情我都可以告诉你。

youdao

I could tell she spoke in earnest.

我看得出她是郑重其事地说的。

《牛津词典》

I could tell (that) he was angry from his expression.

从他的表情我看得出他生气了。

《牛津词典》

I could tell from the surrounding mountains that we were on the bottom of a long dead sea.

VOA: special.2011.07.23

For all I could tell, people did equally well but this experiment has been done tens of thousands of times and you could do it yourself on a computer screen.

据我所听到的，两次都差不多,但这个实验做过几十万次,你们可以在电脑上做。

耶鲁公开课 - 心理学导论课程节选

For instance, when I asked their major, they answered "course 2." Could you tell us about that?

例如，我问他们的专业，他们回答“课程2”，你能给我们解释一下吗？

求学热十足的学校 - SpeakingMax英语口语达人

"I mean, I could tell him anything, and he wouldn't say anything to anybody, " she continued.

BBC: From choirboy to killer?

From what I could tell, both the host and the guest were straight shooters.

FORBES: Why Cutting Government Spending Isn't A Danger To The Economy

If I had better network coverage I could tell you more but bear with me.

FORBES: Shivering On the Eve of The General Strike in Spain