The past participle for ' í' ' verbs is formed as follows:
1. Get the verb in its infinitive form:
condusí'
2. Remove the ' í' '
condus-
3. Then add a 'ío'
condusío
4. Join it to the verb 'havé''
llo ha condusío
In the next post I will explain how to form the past participle for ' á' ' verbs.