Computers, the Internet, and communication devices are fundamental to financial progress and they make things possible that wouldn't have been possible before.

计算机,网络,通讯设备,是金融进步的基础,正是这些技术使得过去不可能的事情,如今变成了现实

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This is great when you want to express regret for something that you perhaps did not do.

当你想表达对一些过去没做成的事情感到后悔时，你可以使用这个句型。

I should have 课堂 - SpeakingMax英语口语达人

The president would spend at least a half hour going over what happened overnight, what the intelligence community was picking up about threats to the country.

总统至少要花半个小时,来了解过去一晚发生的事情，了解情报局选取的,可能威胁国家的信息。

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and something that you were doing or how you were being in the past.

和一些你过去已做过的事情，或是你过去是什么样子的。

I was 课堂 - SpeakingMax英语口语达人

And it's talking about the past, about something that you did before,

它用来表示你过去做过的事情，

I used to 课堂 - SpeakingMax英语口语达人

I got to do what you're doing right now.

我过去要做你现在正在做的事情。

在超市遇到的人 - SpeakingMax英语口语达人

These patterns of "I've been" are so useful to say what you want to do in the future in relationship to the past.

当你想表达过去与你将来想做的事情之间的联系时，“I've been”句型特别有用，

I've been 课堂 - SpeakingMax英语口语达人

Or something you were doing in the past.

以及你过去做过的一些事情。

I was 课堂 - SpeakingMax英语口语达人