Question

They must have left the keys behind. change the sentence into passive voice​

Answer 1

The keys must have been left behind.

Answer 2

The keys must have been left behind by them.

Here the given sentence is in active voice so we have to convert it into passive voice.

While converting active voice sentence into passive voice do the following changes-

• First we have to identify the object of the given sentence and begin the passive voice sentence with the same.
• Hear the object of the given sentences the keys.
• The tense of the given sentences present perfect so according to the at we have to use proper helping verb after the keys.
• Here we have to use must have.
• As it is present perfect tense so we should also use been after helping verb.
• We should use past participle form of the verb in passive voice.
• We should use by and after that we should write down the subject of the given sentence.

To know more about change the voice visit the following links-

https://brainly.in/question/5753593

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Explanation: