Which sentence is in passive voice?Sam must have been exhausted by that long flight to Australia.The twenty-two-hour flight to Australia must have utterly exhausted Sam.Submit

The sentence in passive voice is "Sam must have been exhausted by that long flight to Australia."

Here's why:

1. In the passive voice, the subject of the sentence is acted upon by some other agent or by something unnamed. In this case, "Sam" is the subject and he is being acted upon by "that long flight to Australia."

2. The structure of a passive voice sentence is typically: subject + auxiliary verb (be, am, is, are, was, were, being, been) + past participle + by + agent. This sentence follows that structure: "Sam" (subject) + "must have been" (auxiliary verb) + "exhausted" (past participle) + "by" + "that long flight to Australia" (agent).

3. On the other hand, "The twenty-two-hour flight to Australia must have utterly exhausted Sam" is in active voice. In this sentence, the subject ("The twenty-two-hour flight to Australia") is doing the action (exhausting Sam).