Have/has are used with the past participle of the main verb (here, been ); improved is the past participle of another verb, acting as an adjective. Your last example is correct as well.
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Khai Transo when has been/had been are used, do we always use the past participle of the following verb?Only if your sentence is intended to be passive.
Khai Tran "This house had been rebuilt before we moved in" or
"I
Khai TranI thought we only use have/has with past participleNo.
Khai TranI just want to make sure: " I have been finished with my homework" would be passive right?No. I deliberately ignored that one because it doesn't follow the same pattern.