How do we convert active voice in passive voice ???????????????

Dear student, When the verb is in the simple present tense RULE:auxiliary verb (is/am/are) + III form of verb Gagan throws the stone. The stone is thrown by Gagan. When the verb is in the present continuous tense RULE: auxiliary verb (is/am/are) + being + III form of verb Gagan is throwing the stone. The stone is being thrown by Gagan. When the verb is in the present perfect tense RULE: auxiliary verb (has/have) + been + III form of verb Gagan has thrown the stone. The stone has been thrown by Gagan. When the verb is in the simple past tense RULE: auxiliary verb (was/were) + III form of verb Gagan threw the stone. The stone was thrown by Gagan. When the verb is in the past continuous tense RULE: auxiliary verb (was/were) + being + III form of verb Gagan was throwing the stone. The stone was being thrown by Gagan. When the verb is in the past perfect tense RULE: auxiliary verb (had) + been + III form of verb Gagan had thrown the stone. The stone had been thrown by Gagan. When the verb is in the simple future tense RULE: modal verb (will/shall) + be + III form of verb Gagan will throw the stone. The stone will be thrown by Gagan. Hope this information helps,Regards.