I suddenly realized what I had to do.

我突然明白我该怎么做了。

《牛津词典》

I suddenly realized something that I had not paid attention to before.

我突然意识到一些我以前没有注意到的事情。

youdao

I suddenly realized I had also forgotten to prepare a valentine for Michael Rogers.

我突然意识到我也忘记给迈克尔·罗杰斯准备情人节礼物了。

youdao

I suddenly realized I was in this absurd situation: I am an amateur baker, I hadn't been in a church in years, I barely speak French, and found myself going over to try to restore the lost 1300-year-old tradition of baking at the abbey."

VOA: standard.2010.07.16

Suddenly,I realized I had not looked at the drop of water for several days.

VOA: special.2009.07.25

Suddenly,I realized I had fallen in love with this tiny creature!

VOA: special.2009.07.25

Now I can bring Alibaba public anytime, and I suddenly realized that, no too early.

CNN: Jack Ma Talkasia Transcript

With the sweat literally popping out of my head I suddenly realized something.

FORBES: Having A Recovery In The Warm California Sun

That's not how I remembered it, but I suddenly realized that I was buying not just sugary treats, but emergency provisions.

WSJ: Merrill Markoe on a Dark and Lonely Road Trip | Traveler's Tale