The action represented by the present perfect participle appears before the action represented by the predicate verb, and is often used as an adverbial to indicate the time and reason. Time is often placed at the beginning of a sentence, and the reason is often placed at the end or the beginning of a sentence. For example:

The police took down our names and addresses and let us disappear. The police took down our names and addresses and let us go. (Table time)

I can't accept your invitation because I have promised to take my mother to the concert. I can't accept your invitation because I have promised to accompany my mother to the concert. (Table reason)

I can't tell you what kind of person he is because I haven't met him. I haven't seen him, so I can't tell him what he looks like. (Table reason)

At present, perfect participles are generally not used as attributes.

Now the perfect participle can also be used in the independent structure of participle. For example:

When it was my turn, I was led into the examination room. When it was my turn, I was led into the examination room.

The perfect present participle can sometimes be replaced by the general present participle. For example:

Through the mud wall, they found a group of cheerful people gathered together. Passing through the earth wall, they found a group of people gathered together. (Passed = Passed)

Sometimes it means the completed action, but the meaning of the two is slightly different; There is no gap between the former and the predicate verb, while the latter has a gap with the predicate verb. Try to compare:

After locking the door, she went out. She locked the door and went out. (There is no time interval between locking and extinguishing)

After smoking his pipe, he stood up from the table. After he finished smoking his pipe, he stood up from the table. There is a gap between the end and the rose, so that it is not rude.

I hope it can help you solve the problem.