Question

She (wore /worn) a necklace made of pearls. She has (wore /worn) it many times.
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Answer 1

Answer:

She _wore_ a necklace.....

She_worn_it....

Answer 2

She wore a necklace made of pearls. Shr had worn it many times.

Explanation:-

In first line, simple past tense is used so verb 2nd form will be applicable.

But in second line, due to 'has' present perfect tense is used , so past participle form or verb 3rd form will be applicable.

I hope you will get it if you know tenses.