意识到 + Clause
识 (shí) can mean "to recognize" or "to identify," often appearing in compound words like 意识 (yìshí, "to realize/be aware of") or 认识 (rènshi, "to recognize/know"). In the compound 意识到, it conveys the moment of becoming aware of or recognizing something. This character carries the sense of perceptual or cognitive recognition.
他终于意识到了自己的错误。
Tā zhōngyú yìshí dàole zìjǐ de cuòwù.
He finally realized his own mistake.
我没有意识到时间过得这么快。
Wǒ méiyǒu yìshí dào shíjiān guò de zhème kuài.
I didn't realize time had passed so quickly.
她突然意识到钥匙忘在家里了。
Tā tūrán yìshí dào yàoshi wàng zài jiālǐ le.
She suddenly realized she had left her keys at home.