1. The street is closed for construction.
2. The city has closed the street for construction.
3. They have closed the street for construction.
(What is the suitable active voice of #1?)
4. The door was shut.
5. He had shut the door.
6. They had shut the door.
(Which one is the passive voice of #4? Which subject is suitable as the subject in the active voice? Do we have to use the structure "had p.p." here?)
2 is better than 3 as the active voice version of 1 because "They" in 3 has no antecedent.
Both 5 and 6 are passives for 4 since there is no "by ___" in 4.
Since 4 is in past tense, either present perfect or past perfect will make sense in 5 and 6.
Numbers one and four are not in active voice; they are passive. The subject is the road or the door. It just is whatever it is, closed or shut. In active voice, it is the city or "they" or "he" who did the action in closing the street or the door.
Reed is right. Sentences 5 and 6 are the active voice versions of 4.
1. The suitable active voice for sentence #1 "The street is closed for construction" would be "They closed the street for construction." In the active voice, the subject of the sentence performs the action directly.
2. The passive voice of sentence #4 "The door was shut" would be "The door had been shut." In the passive voice, the subject receives the action instead of performing it. And to convert it into the passive voice, you'll need to use the structure "had been p.p.".
In the case of rephrasing the sentence #4 into the active voice, you have two options:
a) "Someone shut the door." - In this case, you would use a general subject "someone" instead of specifying who shut the door.
b) "He shut the door." - Here, you specify a specific subject pronoun "he" to indicate who shut the door.
By using either option, you can change the sentence from passive to active voice.