Answer:

If we change those sentences into passive voice, these are what we get.

1. Your reservation has been confirmed by us.
2. A beautiful picture has been made by them.
3. The assignment has been finished by my friends.
4. Ani has been called by my sister.
5. A poem has been written by me.

Explanation:

Remember the main formula of passive voice.

Formula: be + Verb-3

Or in complete formula: Object + be + Verb-3 + by + Subject (in object pronoun form)

But, pay attention to this question. In this problem, the sentences are in PRESENT PERFECT tense. Hence, we must use present perfect formula in passive form. Below is the main formula.

Formula: have/has + been + Verb-3

In complete formula: Object + have/has + been + Verb-3 + by + Subject (in object pronoun form)

Now, let's surf into the problem.

Example, number 1, " We have confirmed your reservation."

Here, we get that ....

• 'we' as the subject
• 'have confirmed' as the verb
• 'your reservation' as the object

Okay, now, we can use them as the explanation above to change the sentences into passive form.

• 'we' is changed to 'us'
• 'have confirmed' change into 'has been confirmed' (why we use 'has'? Because, the object is singular, so we use 'has')
• 'your reservation' still as the object

Then ....

Passive formula: Object + have/has + been + Verb-3 + by + Subject (in object pronoun form)

Fill in the formula,

Passive form: Your reservation has been confirmed by us.

Here, I attach the pronoun chart below to make easy to answer.

Keywords: passive voice, present perfect, object pronoun