Explanation

The sentence is in present perfect tense ("have lost"), so the passive form is "have been lost."

Subject "we" changes to "by us" in the passive voice, making the correct form: "Our keys have been lost by us."

Explanation

The entire house was painted by Tahir.

The original sentence is in simple past tense ("painted"), so the passive voice must also be in simple past.

"Was painted" correctly changes the active sentence to passive in past tense.

Explanation

The results will be announced soon.

The sentence is in the future tense, and the passive voice version should match this tense.

Explanation

The given sentence is in active voice (past continuous tense): She was motivating her friends.

In passive voice, the object (her friends) becomes the subject: Her friends were being motivated by her.

Explanation

By whom were you taught such things?

In passive voice, the structure changes to "By whom + auxiliary verb + subject + past participle."

"Were" is correctly placed before "you" to maintain proper question formation.

Explanation

Present perfect passive structure: has/have been + past participle

Active: I have written a story.

Passive: A story has been written by me.

Explanation

Why has this jug been broken by you?

The structure for passive voice in present perfect tense: has/have + been + past participle.

The subject “you” becomes the agent, and “this jug” becomes the subject of the passive sentence.

Explanation

"Whom" is the objective case of "who," used when referring to the object of the verb (here, "punish").

Example: Whom did you invite? (Correct because "invite" acts on "whom").

Explanation

Passive voice of "Someone has broken your pen" is formed as:

Object + has/have been + past participle + by + subject

So, "Your pen has been broken by someone" is grammatically correct.

Explanation

Passive voice of "I am writing a letter" is formed as:

Object + is/are being + past participle + by + subject

So, "A letter is being written by me" is correct.