1. Explain it simply
Add a result word right after the verb: verb + 完/好/懂/到/见。
完 = finished, 好 = ready, 懂 = understand, 到/见 = succeed in reaching or perceiving.
The result attaches to the verb; the object and 了 come after: 做完作业了, 看见他了。
2. Show examples
我做完作业了。
Wǒ zuòwán zuòyè le.
I finished the homework.
做 + 完
我听懂中文了。
Wǒ tīngdǒng Zhōngwén le.
I understood the Chinese.
听 + 懂
我找到手机了。
Wǒ zhǎodào shǒujī le.
I found the phone.
找 + 到 = succeeded
3. Share a tip
Don't split the verb and its result. Say 看见他了, not 看他见了 - the result comes straight after the verb.

