The present tense of broken is:
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The present perfect tense of "broke" is "have broken."
The present perfect tense of "break" is "has/have broken." For example, "I have broken my phone."
Broken is a past participle, which doesn't show any tense without auxiliary verbs. Examples: Had broken - past perfect tense Has/Have broken - present perfect tense Will have broken - future perfect tense
The sentence "Can you repair this broken vase" is in the present tense. It is a question asking if someone can fix the broken vase at the current moment.
Past tense: broke Present tense: break Future tense: will break