Explanation

This is a sentence of Past Continuous Tense.

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

Explanation

Active: Subject + past tense form of the verb + object
Passive: Object of the active sentence + was/were + past participle form of the verb + by + subject of the active sentence

Passive: I was ordered to bring a glass of water by him

Explanation

Active Voice: Let + indirect object + first form of a verb + direct object.

Passive Voice: Let + direct object + be + third form of a verb + by + indirect object.

Explanation

should not – (Modal) changes to should not be in Passive.
Given sentence is an Imperative sentence and started with Please that means sentence contains a request in it.

Rule:
Please /kindly → You are requested to. You are requested + rest of sentence.

Note: Please and kindly are not used in passive voice.

Explanation

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

Explanation

Active Voice: It + be + to + first form of a verb + other sentence

Passive Voice: It + be + for + object + to + be + third form of a verb. 

Explanation

Active voice: The People elected him the president of their country.

This is simple past tense, so the passive voice should also be in simple past → was elected.

The correct structure:

Subject + was elected + complement + by + agent

→ He was elected the president of their country by the people.

Explanation

• The correct change of voice from active to passive is: "Where are the current magazines kept?"
• The original sentence is in the active voice, and the correct conversion to the passive voice is by changing the subject and verb order,
• and using the auxiliary verb "are" to form the passive construction.

Explanation

This sentence belongs to Past Indefinite Tense.

Active Voice: He helped me. 

Passive Voice: I was helped by him. 

Explanation

She reads a book (Present Indefinite tense)

For the passive voice, we use Present continuous tense