Yes, I'm going to talk about 'the passive of perfective verbs'.
The passive or passive voice is formed with the different tenses of 'be' and the past particle of a verb, for example, we can say 'My bike was stolen'. You may wonder if you can say 'My bike is stolen'?
Good question! My answer is yes. If you use the past tense 'was', you're emphasizing the action - you mean your bike was stolen by someone, yesterday or any day in the past. When you say 'My bike is stolen', you just mean the 'result