My life was once very difficult - when you think of the position I used to be in and what I had to do to arrive where I am now in my professional career.

我的生活曾经非常困难—当你想到我曾经所处的位置，以及，我必须做些什么才能达到我职业生涯中现在的位置。

youdao

I don't feel sorry for Carl. He knew the score, he knew what he had to do and couldn't do it.

我并不为卡尔感到难过。他了解实情，他知道他必须做什么，但又没能做成。

《柯林斯英汉双解大词典》

He knew where I fitted in and what he had to do to get the best out of me.

他知道我在哪里能发挥作用，以及他怎样做才能发挥我的最佳水平。

《柯林斯英汉双解大词典》

"You had a very good feeling for what it was you were all trying to do together and I think that is a sign of a particularly good leader."

VOA: standard.2010.04.21

This is actually something very near and dear to my heart because I literally would not be doing what I do in life today had I not taken a couple of courses here, this one in particular, pass fail.

事实上，我是很关心的,因为今天我就不会站在这里,如果当初我没有这里上课的话，这门课，要么过要么挂科。

哈佛公开课 - 计算机科学课程节选

and I had to present myself and say what I would do if I were a tour guide.

我必须自我陈述，然后阐述如果我当上了导游我会做什么。

丰富多彩的社团活动 - SpeakingMax英语口语达人

"I was just doing my job, and I knew what I had to do, " she says.

CNN: Doctor's quick thinking saves patients

As I went into Sunday's 50 meters freestyle, I knew what I had to do and I knew what I wanted.

CNN: STORY HIGHLIGHTS

''I've always been very blunt and vocal, but what I said had nothing to do with race.

BBC: Singapore PM urges 'respect' after Facebook rant