1. The road is closed for construction.

(What is the active voice sentence of #1?)

2. The city has closed the road for construction.

3. The city closes the road for construction. •English - Writeacher, Wednesday, November 16, 2016 at 3:24pm
I'd say #2 is the active version of #1.
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Thank you for your help.
What about 1-2? Can it be an active voice sentence for #2?

1. The road is closed for construction.

1-2. The road has been closed for construction.

2. The city has closed the road for construction.

What about the following?
In this case, can #5 be the active version for #4?

4. The city closes the road for constuction from time to time.

5. The road is closed for construction from time to time by the city.

Active voice denotes that the subject of the verb is doing or has done the action. 1-2 is not in active voice. The road didn't close itself. #4 is in active voice, #5 is not; it is in passive voice. The road had the action done to it by the city.

Thank you for your help. I corrected some errors.

Thank you for your help.
What about 1-2? Can it be a "passive" voice sentence for #2?

1. The road is closed for construction.

1-2. The road has been closed for construction.

2. The city has closed the road for construction.

What about the following?
In this case, can #5 be the "passive" version for #4?

4. The city closes the road for constuction from time to time.

5. The road is closed for construction from time to time by the city.

Yes. The city is doing the action, closing the road. The road is the subject of the sentence, but is not doing the action, the city is.

Yes, in both cases, the sentences you provided can be considered the active voice versions of the original sentences.

In the first case:

4. The city closes the road for construction from time to time.

5. The road is closed for construction from time to time by the city.

Here, #5 can be considered the active version of #4. In the original sentence, #4, the subject ("the city") is performing the action of closing the road. In the active voice sentence, #5, the subject ("the road") is now receiving the action of being closed by the city.

Similarly, in the second case:

1. The road is closed for construction.

1-2. The road has been closed for construction.

2. The city has closed the road for construction.

Here, #1-2 can be considered the active version of #2. The original sentence, #2, is already in the active voice, where the subject ("the city") is performing the action of closing the road. However, in #1-2, the verb tense has been changed to "has been closed" to still maintain the active voice, but with a different tense.

In summary, both #5 and #1-2 can be considered the active voice versions of #4 and #2, respectively.