Active sentences in the simple past tense have the following structure:
Subject + past tense form of the verb + object
Passive sentences in the simple past tense have the following structure:
Object of the active sentence + was/were + past participle form of the verb + by + subject of the active sentence

Active sentences in the present perfect tense have the following structure:
Subject + has/have + past participle form of the verb + object
Passive sentences in the present perfect tense have the following structure:
Object of the active sentence + has/have + been + past participle form of the verb + by + subject of the active sentence

Active sentences in the present continuous tense have the following structure:
Subject + is/are/am + -ing form of the verb + object
Passive sentences in the present continuous tense have the following structure:
Object of the active sentence + is/are/am + being + past participle form of the verb + by + subject of the active sentence.

Simple Present tense

An Active sentence in the simple present tense has the following structure:
Subject + first form of the verb + object

Sentences which express request, order, advice, suggestion, prohibition etc., are called imperative sentences.