I didn't realize you had company.

我不知道你有客人。

《牛津词典》

I didn't realize (that) you were so unhappy.

我没有察觉到你那么不开心。

《牛津词典》

I didn't realize you had political aspirations.

我没有意识到你有政治上的抱负。

《牛津词典》

Though at that time I didn't realize it was going to last 16 years or longer.

我还不知道它能用,16年以上。

耶鲁公开课 - 死亡课程节选

I guess I don't real, I didn't realize how great it was, um, to live there until I left.

我想直到离开，我才意识到，住在马德里是多么好的事情。

来自西班牙 - SpeakingMax英语口语达人

I didn't realize that girls shed so much hair, you know...

因为我没意识到女生掉的头发那么多。

与室友和睦相处 - SpeakingMax英语口语达人

Like, we - I was hungry and I was always so involved, I didn't realize that.

NPR: Child Hunger: Nutritious Food Tough To Afford

"The show became a monster, and I didn't realize how big this was going to be, " he says.

FORBES: Celebrity 100

"I didn't realize it was this big, " he confesses, speaking candidly about the sheer size of the 14-year-old company he's now shepherding.

ENGADGET: An interview with PayPal president David Marcus: as offline / retail prominence grows, a renewed focus on customer service