1. Explain it simply
A number + 次 is a frequency complement that tells how many times something happened.
It comes after the verb, often with the experiential 过: 我去过两次。
When the object is a personal pronoun (他/她/你), put the number + 次 after the pronoun: 我找过他两次。
2. Show examples
我去过北京两次。
Wǒ qù guo Běijīng liǎng cì.
I have been to Beijing twice.
after the verb
我看过那个电影三次。
Wǒ kàn guo nàge diànyǐng sān cì.
I have watched that movie three times.
number + 次
我找过他两次。
Wǒ zhǎo guo tā liǎng cì.
I have looked for him twice.
pronoun, then 次
她来过一次。
Tā lái guo yī cì.
Sandhi:Tā lái guo yí cì.
She has come once.
no object
3. Share a tip
Put the number + 次 after the verb. If the object is a personal pronoun (他/她/你), the number + 次 goes after the pronoun, not before it: 我找过他两次 (not 我找过两次他).