So can be changed slightly, depending on tense, past, present or future as well as whether or not you want to ask a question.

因此这个句型要根据不同的时态，如过去时、现在时和将来时，作出一点调整；另外也会根据是否是问句而略有不同。

There is 课堂 - 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