It was not long before I realized I was wrong.

不久我就意识到我错了。

youdao

The moment I saw her, I realized something was wrong.

我一看到她，就觉得不太对劲。

《牛津词典》

I quickly realized that I was on the wrong train.

我很快意识到我坐错了火车。

《牛津词典》

"I was right there, so even though I was far from the door, at least I realized something was wrong, " said Rodrigo Rizzi, a first-year nursing student who was next to the stage when the fire broke out and watched the tragedy unfold, horror-stricken and helpless.

NPR: No Alarm, Only 1 Exit In Brazil Nightclub Fire

But pondering what Cowen had to say, I had a strange reaction: I realized that he was right and I was wrong!

FORBES: You're on Your Own

But I withdrew from it, because I realized it was the wrong thing to do.

NEWYORKER: The Visionary