The active form of the sentence "It has been stolen" is:

Tenses	Rules and Formula	Examples
Simple Present Tense	Subject + Verb in the base form/third person plural form + the rest of the sentence	Keerthi eats bread and butter before going to school.
Present Continuous Tense	Subject + Helping Verb(am/is/are) + Main verb + ing + the rest of the sentence	Students are going to school.
Present Perfect Tense	Subject + Helping Verb (have/has) + Past participle of the main verb + the rest of the sentence along with the time frame	She has lived here all her life.
Present Perfect Continuous Tense	Subject + Have/Has + Been + Verb+ ing + the rest of the sentence	I have been working on this project for a week.
Simple Past Tense	Subject + Verb + ed / verb in the past tense + the rest of the sentence	Nupur went to the supermarket yesterday.
Past Continuous Tense	Subject + Helping Verb(was/were) + Main verb + ing + the rest of the sentence	It was snowing today.
Past Perfect Tense	Subject + Helping Verb (had) + Past participle of the main verb + the rest of the sentence along with the time frame.	She had met him before the party.
Past Perfect Continuous Tense	Subject + Had + Been + Verb + ing + the rest of the sentence	He had been drinking milk out the carton when Mom walked into the kitchen.
Simple Future Tense	Subject + will/shall + V1 + Object	I will write articles on different topics.
Future Continuous Tense	Subject + will be/shall be + V1 + ing + Object	I will have been waiting here for three hours by six o’clock.
Future Perfect Tense	Subject + will have/shall have + V3 + Object	I will have dressed up by the time you reach home.
Future Perfect Continuous Tense	Subject + will have been + V1 + ing + Object	I will have been waiting here for three hours by six o’clock.