Final answer:
The sentence 'The room is being decorated' is in passive voice because the subject 'the room' is being acted upon, it uses a form of the verb 'be' ('is'), and the sentence could include the preposition 'by' to introduce the doer of the action.
Step-by-step explanation:
The sentence 'The room is being decorated' is an example of a sentence written in passive voice. To determine whether a sentence is in passive voice, you can look for a few key characteristics:
- The subject of the sentence is the recipient of the action rather than the one performing it. In our example, the room is not doing anything; instead, it is being acted upon by an unspecified decorator.
- There is a form of the be verb (in this case, 'is') used together with the past participle of the main verb (in this case, 'decorated').
- The sentence may include or can have the preposition 'by' followed by a noun phrase added, although it's not present in the original sentence. For instance, 'The room is being decorated by the designer' would still maintain passive voice.
Thus, it is clear that the example demonstrates passive voice construction.