见 + Clause
The verb 见 (jiàn) means "to see" or "to perceive," and it is used to describe witnessing or noticing something happen. In narrative contexts, 见 often introduces a subsequent action prompted by what was observed, as in 见女子反抗 (seeing the woman resist).
他见她一个人在哭,就走过去安慰她。
Tā jiàn tā yīgè rén zài kū, jiù zǒu guòqù ānwèi tā.
Seeing her crying alone, he walked over to comfort her.
我见他没回消息,就直接打了电话。
Wǒ jiàn tā méi huí xiāoxi, jiù zhíjiē dǎ le diànhuà.
When I saw that he hadn't replied to the message, I just called him directly.
老师见学生们都到了,便开始上课。
Lǎoshī jiàn xuéshēngmen dōu dào le, biàn kāishǐ shàngkè.
When the teacher saw that all the students had arrived, he began the class.