Answer: i need help on this same question
Explanation:
I don't know a lot but I just did a class about this.
But to change perfect past tense completed in the past by changing the verb is or could be by replacing the verb with the action to was ,did ,before, ect. I think this might help
My best guess would be a gerund phrase because the -ing verb is at the beginning of the sentence, thus making it a noun
I strongly agree with I strongly agree with MCCCHUK